{"id":22681,"date":"2025-05-19T15:03:00","date_gmt":"2025-05-19T09:33:00","guid":{"rendered":"https:\/\/www.pickl.ai\/blog\/?p=22681"},"modified":"2025-05-19T15:03:02","modified_gmt":"2025-05-19T09:33:02","slug":"sequence-in-sql","status":"publish","type":"post","link":"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/","title":{"rendered":"Sequence in SQL: Syntax, Use Cases, and Best Practices"},"content":{"rendered":"\n<p><strong>Summary: <\/strong>A sequence in SQL is a schema-bound object that generates unique numeric values, commonly used for primary keys or custom identifiers. Sequences offer flexibility, allowing values to be pre-generated, shared across tables, and customized for increments, cycling, and limits. They enhance data integrity and support advanced database design requirements.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Introduction\" >Introduction<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#What_is_a_Sequence_in_SQL\" >What is a Sequence in SQL?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Syntax_of_Sequences_in_SQL\" >Syntax of Sequences in SQL<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#SQL_Server_Example\" >SQL Server Example<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Oracle_Example\" >Oracle Example<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#PostgreSQL_Example\" >PostgreSQL Example<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#IBM_DB2_Example\" >IBM DB2 Example<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Core_Use_Cases_for_Sequences\" >Core Use Cases for Sequences<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Automatic_Primary_Key_Generation\" >Automatic Primary Key Generation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Pre-Generating_Values_Before_Insert\" >Pre-Generating Values Before Insert<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Sharing_Unique_Numbers_Across_Multiple_Tables\" >Sharing Unique Numbers Across Multiple Tables<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Custom_Numbering_Schemes_Increment_Cycling_Reseeding\" >Custom Numbering Schemes (Increment, Cycling, Reseeding)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Bulk_Reservation_of_Numbers\" >Bulk Reservation of Numbers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Order-Dependent_Generation\" >Order-Dependent Generation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Ensuring_Uniqueness_Across_Distributed_Systems\" >Ensuring Uniqueness Across Distributed Systems<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Common_Pitfalls_When_Using_Sequences\" >Common Pitfalls When Using Sequences<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Assuming_Gapless_Sequences\" >Assuming Gapless Sequences<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Best_Practice\" >Best Practice<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Uncontrolled_Cycling\" >Uncontrolled Cycling<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Best_Practice-2\" >Best Practice<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Lack_of_Documentation\" >Lack of Documentation<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Best_Practice-3\" >Best Practice<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Conclusion\" >Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#What_Is_the_Main_Difference_Between_a_Sequence_and_an_Identity_Column_In_SQL\" >What Is the Main Difference Between a Sequence and an Identity Column In SQL?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Can_a_Sequence_Be_Shared_Across_Multiple_Tables_In_SQL\" >Can a Sequence Be Shared Across Multiple Tables In SQL?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#Are_Sequence-Generated_Values_Guaranteed_to_Be_Gapless\" >Are Sequence-Generated Values Guaranteed to Be Gapless?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 id=\"introduction\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Introduction\"><\/span><strong>Introduction<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Sequences are powerful and flexible database objects used to generate unique numeric values, often for primary keys or other unique identifiers. Unlike auto-increment or identity columns, sequences are independent schema-level objects that can be shared across tables and customized for a variety of scenarios.<\/p>\n\n\n\n<p>This article explores the syntax, use cases, and best practices for using sequences in <a href=\"https:\/\/www.pickl.ai\/blog\/sql-joins\/\">SQL<\/a>, with practical examples and guidance for different database systems.<\/p>\n\n\n\n<p><strong>Key Takeaways<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sequences generate unique numbers, ideal for auto-incrementing primary keys.<\/li>\n\n\n\n<li>They are independent objects, usable across multiple tables and columns.<\/li>\n\n\n\n<li>Customizable for increment, start, min\/max values, and cycling options.<\/li>\n\n\n\n<li>Sequence values can be pre-generated before inserting table rows.<\/li>\n\n\n\n<li>Not gapless-rollbacks and caching may introduce unused numbers<\/li>\n<\/ul>\n\n\n\n<h2 id=\"what-is-a-sequence-in-sql\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_a_Sequence_in_SQL\"><\/span><strong>What is a Sequence in SQL?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"949\" height=\"458\" src=\"https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-1-2.png\" alt=\" Sequence in SQL\" class=\"wp-image-22684\" srcset=\"https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-1-2.png 949w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-1-2-300x145.png 300w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-1-2-768x371.png 768w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-1-2-110x53.png 110w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-1-2-200x97.png 200w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-1-2-380x183.png 380w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-1-2-255x123.png 255w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-1-2-550x265.png 550w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-1-2-800x386.png 800w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-1-2-150x72.png 150w\" sizes=\"(max-width: 949px) 100vw, 949px\" \/><\/figure>\n\n\n\n<p>A <em>sequence<\/em> in SQL is a database object that generates a series of unique numeric values, typically used to ensure each row in a table has a unique identifier.&nbsp;<\/p>\n\n\n\n<p>Sequences are available in most major relational database management systems (RDBMS), including Oracle, <a href=\"https:\/\/www.pickl.ai\/blog\/case-statement-sql\/\">SQL<\/a> Server, PostgreSQL, and IBM DB2. MySQL, however, uses the AUTO_INCREMENT attribute instead of sequences for most use cases.<\/p>\n\n\n\n<p><strong>Key characteristics:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Generates unique integers (ascending or descending)<\/li>\n\n\n\n<li>Not tied to a specific table or column<\/li>\n\n\n\n<li>Can be accessed and incremented manually<\/li>\n\n\n\n<li>Supports customization (start value, increment, min\/max, cycling)<\/li>\n<\/ul>\n\n\n\n<h2 id=\"syntax-of-sequences-in-sql\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Syntax_of_Sequences_in_SQL\"><\/span><strong>Syntax of Sequences in SQL<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The syntax for creating and using sequences varies slightly between database systems, but the core concepts remain consistent.<\/p>\n\n\n\n<p><strong>General Syntax<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXcgvOezt8uuLEQLiIQSrI5jGFIV_r-jSs_jHMXqrxFz7t47BEajg5fAVUC1bRfIiWBfarmdhhbs2hsX7vyaBKiaHh9uKx0EA9QJ2AGId8hVei_K0usEwi6859IJeQsjpFS2ImCaVw?key=hlGw9XfQemxcVTGX3821Ysda\" alt=\"general Syntax of sequence in SQL\"\/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>sequence_name:<\/strong> Name of the sequence object.<\/li>\n\n\n\n<li><strong>START WITH:<\/strong> The initial value to start the sequence.<\/li>\n\n\n\n<li><strong>INCREMENT BY:<\/strong> The value by which the sequence increases (or decreases).<\/li>\n\n\n\n<li><strong>MINVALUE \/ MAXVALUE:<\/strong> The minimum and maximum values for the sequence.<\/li>\n\n\n\n<li><strong>CYCLE \/ NOCYCLE:<\/strong> Whether the sequence restarts when it reaches its max\/min value.<\/li>\n<\/ul>\n\n\n\n<h3 id=\"sql-server-example\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"SQL_Server_Example\"><\/span><strong>SQL Server Example<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXf5AFLawn-kc92wL23CjtsaEHEUue4_v79RhnW4WCJEAnVkxe1Sk85k6cg8XUotn61BAJnLSTHempTBtSzHSMqhZaddFis3FivSSXpJ-sI0ZkmiI3e-gJAw-ng9ZFlhp2hMCZrmcg?key=hlGw9XfQemxcVTGX3821Ysda\" alt=\"SQL Server Example\"\/><\/figure>\n\n\n\n<p>To get the next value:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXep4IzF3b5zw6yOMXMpv-MuH1-jE-O20Eq6QfW6RhsuWVTr9gkfvh3dhDYBIQwx2DDk8voLYPIhiU6JBKkAQ8LJ9iE-G9909AiHaCFMKBt0INZjCSAdGwFRKvlN8Sstkbh2zBoWdg?key=hlGw9XfQemxcVTGX3821Ysda\" alt=\"SQL Server Example to select next value\"\/><\/figure>\n\n\n\n<p>Or use in an insert:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXfATfJ3H4exVhyAJ8Nx6XWIrapB6KIRzvuo9NhXePlRtaWYvgcXMhyxCFabJ6ivK3-kLvGY7bxu8lCzyK_4Si53wMYHfdWfUYgE2wphQ1cWBCjaQ7iTt3pzQHeg9o0XX5oXqF7icg?key=hlGw9XfQemxcVTGX3821Ysda\" alt=\"code to use an insert\"\/><\/figure>\n\n\n\n<h3 id=\"oracle-example\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Oracle_Example\"><\/span><strong>Oracle Example<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXfcKmO2II3tCCnFAFmi0kh38XXnBB8xrlxH7P_rqR1trgtdjR_f8tpuQuTyT96mymwayoIc88dLcQfVrp6XcRmjr5CvWIneitr6h-bCV4mncCzwM2aMKORyb1u5gEaGsLUkG_l8Iw?key=hlGw9XfQemxcVTGX3821Ysda\" alt=\"Oracle Server Example\"\/><\/figure>\n\n\n\n<p>To get the next value:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXdtE58IzQKN43nbZkq_Kv33eIFtgYJ2yjBkjyQrsAlNZ7GFDVzNFNP8x9-s-Naa4gz7r9fg_d4_j3ZWHEt03ZF97_UF8BNdsgTLFMjzuHwshHg30lkNxhaWh_YZy0IW4RRxuKuEEg?key=hlGw9XfQemxcVTGX3821Ysda\" alt=\"Oracle Server Example to get the next value\"\/><\/figure>\n\n\n\n<h3 id=\"postgresql-example\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PostgreSQL_Example\"><\/span><strong>PostgreSQL Example<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXcUxEqYgvTzF91HqwsqY9rA4HRObt8W3SUBicp6w_p5JIAwGnJwfaL77AAf1X1N6X9PZgGLIsyQ_HKI23KyiD0GGXFzCvqfR0x2OjVX5IFfxqvRo-0PVYwDmtyAIsdQdRcy_Txgfw?key=hlGw9XfQemxcVTGX3821Ysda\" alt=\" PostgreSQL Example\"\/><\/figure>\n\n\n\n<p>To use in a table:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXdJxHzH12QgEs0sfTlrgVuEafxulceVi0nsG4dHvGkZvVyTWGh3GlJjiwn7KOvQv-d2apSumgPiw9EOzXBCSX0uZWNDeaWNGJDyRiUS92ahlstJuOMcmCIZeIaGruRocqE0w3FtvA?key=hlGw9XfQemxcVTGX3821Ysda\" alt=\"\"\/><\/figure>\n\n\n\n<h3 id=\"ibm-db2-example\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"IBM_DB2_Example\"><\/span><strong>IBM DB2 Example<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXfq0WCw7ODkOyR97GjVXUvJ-aPRhPST_-tr12kt8qzhQsnEM_FaV0vKuprTpvZPIfc-pgOdJG0xoJJcypVtLqYJaq2SWssfifyKvF0k2o3Ryi3cTIGha-_fTnx5Ug2re4Raz-CHdQ?key=hlGw9XfQemxcVTGX3821Ysda\" alt=\"IBM DB2 Example\"\/><\/figure>\n\n\n\n<h2 id=\"core-use-cases-for-sequences\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Core_Use_Cases_for_Sequences\"><\/span><strong>Core Use Cases for Sequences<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"781\" src=\"https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-2-2-1024x781.png\" alt=\" core use cases of SQL Sequences\n\" class=\"wp-image-22687\" srcset=\"https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-2-2-1024x781.png 1024w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-2-2-300x229.png 300w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-2-2-768x586.png 768w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-2-2-110x84.png 110w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-2-2-200x153.png 200w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-2-2-380x290.png 380w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-2-2-255x194.png 255w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-2-2-550x419.png 550w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-2-2-800x610.png 800w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-2-2-150x114.png 150w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-2-2.png 1036w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><a href=\"https:\/\/www.pickl.ai\/blog\/stored-procedures-in-sql\/\">Sequences in SQL<\/a> are versatile tools designed to generate unique numeric values, supporting a variety of application needs. Here are the core use cases:<\/p>\n\n\n\n<h3 id=\"automatic-primary-key-generation\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Automatic_Primary_Key_Generation\"><\/span><strong>Automatic Primary Key Generation<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Sequences are commonly used to automatically generate unique primary key values for database tables, ensuring each row is uniquely identifiable without manual intervention. This is especially useful in systems where the primary key must be an integer and needs to be generated outside the table definition<\/p>\n\n\n\n<h3 id=\"pre-generating-values-before-insert\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Pre-Generating_Values_Before_Insert\"><\/span><strong>Pre-Generating Values Before Insert<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Unlike identity columns, sequences allow applications to generate a unique number before inserting a row into a table. This is valuable when the identifier is needed in application logic or as a foreign key in related tables before the actual insert occurs.<\/p>\n\n\n\n<h3 id=\"sharing-unique-numbers-across-multiple-tables\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sharing_Unique_Numbers_Across_Multiple_Tables\"><\/span><strong>Sharing Unique Numbers Across Multiple Tables<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A single sequence can be referenced by multiple tables or columns, providing a global unique identifier across different entities. This is ideal for scenarios like event tracking or audit logs, where events from different sources need a unified, sequential identifier.<\/p>\n\n\n\n<h3 id=\"custom-numbering-schemes-increment-cycling-reseeding\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Custom_Numbering_Schemes_Increment_Cycling_Reseeding\"><\/span><strong>Custom Numbering Schemes (Increment, Cycling, Reseeding)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Sequences can be configured to increment by any value, cycle back to a start value after reaching a maximum, or be reseeded as needed. This flexibility supports use cases such as ticket numbers, batch numbers, or business-specific numbering requirements.<\/p>\n\n\n\n<h3 id=\"bulk-reservation-of-numbers\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Bulk_Reservation_of_Numbers\"><\/span><strong>Bulk Reservation of Numbers<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Some systems allow reserving a range of sequence numbers in advance, which is useful for batch inserts or distributed systems that require a block of unique identifiers to minimize contention and improve performance.<\/p>\n\n\n\n<h3 id=\"order-dependent-generation\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Order-Dependent_Generation\"><\/span><strong>Order-Dependent Generation<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Sequences can be used in conjunction with ordering clauses to generate numbers in a specific order, which is useful for applications that require sorted sequence values based on another field.<\/p>\n\n\n\n<h3 id=\"ensuring-uniqueness-across-distributed-systems\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ensuring_Uniqueness_Across_Distributed_Systems\"><\/span><strong>Ensuring Uniqueness Across Distributed Systems<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>When a unique identifier must be guaranteed across multiple tables, databases, or even servers, sequences provide a reliable mechanism, although high contention may require careful management or alternatives like GUIDs for distributed environment.<\/p>\n\n\n\n<h2 id=\"common-pitfalls-when-using-sequences\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Pitfalls_When_Using_Sequences\"><\/span><strong>Common Pitfalls When Using Sequences<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"925\" height=\"490\" src=\"https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-3-2.png\" alt=\"how to avoid common pitfalls when using Sequence\n\" class=\"wp-image-22690\" srcset=\"https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-3-2.png 925w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-3-2-300x159.png 300w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-3-2-768x407.png 768w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-3-2-110x58.png 110w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-3-2-200x106.png 200w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-3-2-380x201.png 380w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-3-2-255x135.png 255w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-3-2-550x291.png 550w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-3-2-800x424.png 800w, https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-3-2-150x79.png 150w\" sizes=\"(max-width: 925px) 100vw, 925px\" \/><\/figure>\n\n\n\n<p>Alt Text: Image showing how to avoid common pitfalls when using Sequence<\/p>\n\n\n\n<p>While sequences are powerful and flexible, improper usage or misunderstanding of their behavior can lead to unexpected issues. Here\u2019s an expanded look at the most common pitfalls:<\/p>\n\n\n\n<h3 id=\"assuming-gapless-sequences\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Assuming_Gapless_Sequences\"><\/span><strong>Assuming Gapless Sequences<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A frequent misconception is that sequence-generated values will be perfectly sequential and gapless. In reality, sequences are designed to guarantee uniqueness and order of generation, not continuity. Several factors can introduce gaps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Transaction Rollbacks:<\/strong> If you generate a sequence value during a transaction that is later rolled back, the value is not returned to the pool. That number is lost, resulting in a gap.<\/li>\n\n\n\n<li><strong>Failed Transactions:<\/strong> Similar to rollbacks, any failed insert or operation that consumes a sequence value but does not persist data will leave a gap.<\/li>\n\n\n\n<li><strong>Caching:<\/strong> Many databases cache sequence values in memory for performance reasons. If the database crashes or is restarted, any unused cached values are lost, creating additional gaps.<\/li>\n\n\n\n<li><strong>Explicit Skipping:<\/strong> Some applications or scripts might intentionally or accidentally increment a sequence without using the value, causing further discontinuities.<\/li>\n<\/ul>\n\n\n\n<h4 id=\"best-practice\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Best_Practice\"><\/span><strong>Best Practice<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>If your application requires strictly gapless numbering (for example, invoice numbers mandated by law), you should not rely solely on sequences. Instead, implement additional logic at the application or database level to control numbering and handle exceptions.<\/p>\n\n\n\n<h3 id=\"uncontrolled-cycling\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Uncontrolled_Cycling\"><\/span><strong>Uncontrolled Cycling<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Sequences can be configured to cycle, meaning they restart from the minimum value after reaching their maximum (or vice versa for descending sequences). While this feature is useful in certain scenarios, it can be dangerous if not managed properly:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Duplicate Values:<\/strong> If a sequence cycles and the previous values are still in use, generating the same number again can lead to primary key violations, data corruption, or loss of data integrity.<\/li>\n\n\n\n<li><strong>Business Logic Errors:<\/strong> Applications that assume sequence values are always unique and never reused may malfunction or produce incorrect results when cycling occurs.<\/li>\n\n\n\n<li><strong>Unexpected Behavior:<\/strong> Developers or DBAs may not realize a sequence is set to cycle, leading to subtle bugs that surface only after a large number of values have been generated.<\/li>\n<\/ul>\n\n\n\n<h4 id=\"best-practice-2\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Best_Practice-2\"><\/span><strong>Best Practice<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Use the CYCLE option only when you are certain that reusing values will not cause conflicts. For most primary key or unique identifier scenarios, always use NOCYCLE to prevent accidental duplication.<\/p>\n\n\n\n<h3 id=\"lack-of-documentation\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Lack_of_Documentation\"><\/span><strong>Lack of Documentation<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Sequences are often created and used without sufficient documentation, which can lead to several problems:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Accidental Reuse:<\/strong> Without clear documentation, developers might unknowingly use the same sequence for unrelated tables or purposes, causing confusion or data integrity issues.<\/li>\n\n\n\n<li><strong>Misconfiguration:<\/strong> Lack of clarity about a sequence\u2019s intended increment, min\/max values, or cycling behavior can result in misconfiguration during schema changes or migrations.<\/li>\n\n\n\n<li><strong>Maintenance Challenges:<\/strong> When troubleshooting or updating database schemas, unclear sequence usage makes it difficult to assess the impact of changes, increasing the risk of errors.<\/li>\n<\/ul>\n\n\n\n<h4 id=\"best-practice-3\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Best_Practice-3\"><\/span><strong>Best Practice<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Always document each sequence\u2019s purpose, configuration, and usage. Include comments in the database schema, maintain up-to-date documentation, and ensure all developers and DBAs understand the role of  sequence in your system.<\/p>\n\n\n\n<h2 id=\"conclusion\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Sequences are a robust and flexible mechanism for generating unique values in SQL databases. They offer significant advantages over identity columns and auto-increment fields, particularly in complex or distributed systems. By understanding their syntax, use cases, and best practices, you can harness sequences to ensure data integrity, scalability, and maintainability in your database applications.<\/p>\n\n\n\n<h2 id=\"frequently-asked-questions\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span><strong>Frequently Asked Questions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 id=\"what-is-the-main-difference-between-a-sequence-and-an-identity-column-in-sql\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_the_Main_Difference_Between_a_Sequence_and_an_Identity_Column_In_SQL\"><\/span><strong>What Is the Main Difference Between a Sequence and an Identity Column In SQL?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A sequence is a standalone object that can generate unique numbers for any table or application, while an identity column is tied to a specific table column and generates values only during row insertion.<\/p>\n\n\n\n<h3 id=\"can-a-sequence-be-shared-across-multiple-tables-in-sql\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_a_Sequence_Be_Shared_Across_Multiple_Tables_In_SQL\"><\/span><strong>Can a Sequence Be Shared Across Multiple Tables In SQL?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Yes, a sequence can serve multiple tables to ensure unique values, useful for audit logs or event tracking.<\/p>\n\n\n\n<h3 id=\"are-sequence-generated-values-guaranteed-to-be-gapless\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Are_Sequence-Generated_Values_Guaranteed_to_Be_Gapless\"><\/span><strong>Are Sequence-Generated Values Guaranteed to Be Gapless?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>No, sequence-generated values may have gaps due to rollbacks, failed transactions, or caching. If gapless numbering is required, additional logic must be implemented at the application level.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"Generates unique, customizable numeric values for primary keys, supports pre-generation, sharing, and advanced numbering.\n","protected":false},"author":4,"featured_media":22693,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[613],"tags":[4021,2199,4022],"ppma_author":[2169,2183],"class_list":{"0":"post-22681","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-sql","8":"tag-sequence-in-sql","9":"tag-sql","10":"tag-sql-sequence"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Sequence in SQL: What It Is and How to Use It Easily<\/title>\n<meta name=\"description\" content=\"Learn about SQL Sequence database objects for generating unique numeric values. Discover their syntax, use cases and practices for efficient primary key generation.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sequence in SQL: Syntax, Use Cases, and Best Practices\" \/>\n<meta property=\"og:description\" content=\"Learn about SQL Sequence database objects for generating unique numeric values. Discover their syntax, use cases and practices for efficient primary key generation.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/\" \/>\n<meta property=\"og:site_name\" content=\"Pickl.AI\" \/>\n<meta property=\"article:published_time\" content=\"2025-05-19T09:33:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-05-19T09:33:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-4-2.png\" \/>\n\t<meta property=\"og:image:width\" content=\"735\" \/>\n\t<meta property=\"og:image:height\" content=\"562\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Neha Singh, Nitin Choudhary\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Neha Singh\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"9 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/sequence-in-sql\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/sequence-in-sql\\\/\"},\"author\":{\"name\":\"Neha Singh\",\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/#\\\/schema\\\/person\\\/2ad633a6bc1b93bc13591b60895be308\"},\"headline\":\"Sequence in SQL: Syntax, Use Cases, and Best Practices\",\"datePublished\":\"2025-05-19T09:33:00+00:00\",\"dateModified\":\"2025-05-19T09:33:02+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/sequence-in-sql\\\/\"},\"wordCount\":1377,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/sequence-in-sql\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/05\\\/unnamed-4-2.png\",\"keywords\":[\"sequence in sql\",\"SQL\",\"sql sequence\"],\"articleSection\":[\"SQL\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/sequence-in-sql\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/sequence-in-sql\\\/\",\"url\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/sequence-in-sql\\\/\",\"name\":\"Sequence in SQL: What It Is and How to Use It Easily\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/sequence-in-sql\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/sequence-in-sql\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/05\\\/unnamed-4-2.png\",\"datePublished\":\"2025-05-19T09:33:00+00:00\",\"dateModified\":\"2025-05-19T09:33:02+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/#\\\/schema\\\/person\\\/2ad633a6bc1b93bc13591b60895be308\"},\"description\":\"Learn about SQL Sequence database objects for generating unique numeric values. Discover their syntax, use cases and practices for efficient primary key generation.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/sequence-in-sql\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/sequence-in-sql\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/sequence-in-sql\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/05\\\/unnamed-4-2.png\",\"contentUrl\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/05\\\/unnamed-4-2.png\",\"width\":735,\"height\":562,\"caption\":\"Sequence in SQL: Syntax, Use Cases, and Best Practices\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/sequence-in-sql\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"SQL\",\"item\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/category\\\/sql\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Sequence in SQL: Syntax, Use Cases, and Best Practices\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/\",\"name\":\"Pickl.AI\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/#\\\/schema\\\/person\\\/2ad633a6bc1b93bc13591b60895be308\",\"name\":\"Neha Singh\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/pickl.ai\\\/blog\\\/wp-content\\\/uploads\\\/2024\\\/06\\\/avatar_user_4_1717572961-96x96.jpg3d1a0d35d7a1a929f4a120e9053cbdb5\",\"url\":\"https:\\\/\\\/pickl.ai\\\/blog\\\/wp-content\\\/uploads\\\/2024\\\/06\\\/avatar_user_4_1717572961-96x96.jpg\",\"contentUrl\":\"https:\\\/\\\/pickl.ai\\\/blog\\\/wp-content\\\/uploads\\\/2024\\\/06\\\/avatar_user_4_1717572961-96x96.jpg\",\"caption\":\"Neha Singh\"},\"description\":\"I\u2019m a full-time freelance writer and editor who enjoys wordsmithing. The 8 years long journey as a content writer and editor has made me relaize the significance and power of choosing the right words. Prior to my writing journey, I was a trainer and human resource manager. WIth more than a decade long professional journey, I find myself more powerful as a wordsmith. As an avid writer, everything around me inspires me and pushes me to string words and ideas to create unique content; and when I\u2019m not writing and editing, I enjoy experimenting with my culinary skills, reading, gardening, and spending time with my adorable little mutt Neel.\",\"url\":\"https:\\\/\\\/www.pickl.ai\\\/blog\\\/author\\\/nehasingh\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Sequence in SQL: What It Is and How to Use It Easily","description":"Learn about SQL Sequence database objects for generating unique numeric values. Discover their syntax, use cases and practices for efficient primary key generation.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/","og_locale":"en_US","og_type":"article","og_title":"Sequence in SQL: Syntax, Use Cases, and Best Practices","og_description":"Learn about SQL Sequence database objects for generating unique numeric values. Discover their syntax, use cases and practices for efficient primary key generation.","og_url":"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/","og_site_name":"Pickl.AI","article_published_time":"2025-05-19T09:33:00+00:00","article_modified_time":"2025-05-19T09:33:02+00:00","og_image":[{"width":735,"height":562,"url":"https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-4-2.png","type":"image\/png"}],"author":"Neha Singh, Nitin Choudhary","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Neha Singh","Est. reading time":"9 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#article","isPartOf":{"@id":"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/"},"author":{"name":"Neha Singh","@id":"https:\/\/www.pickl.ai\/blog\/#\/schema\/person\/2ad633a6bc1b93bc13591b60895be308"},"headline":"Sequence in SQL: Syntax, Use Cases, and Best Practices","datePublished":"2025-05-19T09:33:00+00:00","dateModified":"2025-05-19T09:33:02+00:00","mainEntityOfPage":{"@id":"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/"},"wordCount":1377,"commentCount":0,"image":{"@id":"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#primaryimage"},"thumbnailUrl":"https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-4-2.png","keywords":["sequence in sql","SQL","sql sequence"],"articleSection":["SQL"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/","url":"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/","name":"Sequence in SQL: What It Is and How to Use It Easily","isPartOf":{"@id":"https:\/\/www.pickl.ai\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#primaryimage"},"image":{"@id":"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#primaryimage"},"thumbnailUrl":"https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-4-2.png","datePublished":"2025-05-19T09:33:00+00:00","dateModified":"2025-05-19T09:33:02+00:00","author":{"@id":"https:\/\/www.pickl.ai\/blog\/#\/schema\/person\/2ad633a6bc1b93bc13591b60895be308"},"description":"Learn about SQL Sequence database objects for generating unique numeric values. Discover their syntax, use cases and practices for efficient primary key generation.","breadcrumb":{"@id":"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#primaryimage","url":"https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-4-2.png","contentUrl":"https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-4-2.png","width":735,"height":562,"caption":"Sequence in SQL: Syntax, Use Cases, and Best Practices"},{"@type":"BreadcrumbList","@id":"https:\/\/www.pickl.ai\/blog\/sequence-in-sql\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.pickl.ai\/blog\/"},{"@type":"ListItem","position":2,"name":"SQL","item":"https:\/\/www.pickl.ai\/blog\/category\/sql\/"},{"@type":"ListItem","position":3,"name":"Sequence in SQL: Syntax, Use Cases, and Best Practices"}]},{"@type":"WebSite","@id":"https:\/\/www.pickl.ai\/blog\/#website","url":"https:\/\/www.pickl.ai\/blog\/","name":"Pickl.AI","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.pickl.ai\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.pickl.ai\/blog\/#\/schema\/person\/2ad633a6bc1b93bc13591b60895be308","name":"Neha Singh","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/pickl.ai\/blog\/wp-content\/uploads\/2024\/06\/avatar_user_4_1717572961-96x96.jpg3d1a0d35d7a1a929f4a120e9053cbdb5","url":"https:\/\/pickl.ai\/blog\/wp-content\/uploads\/2024\/06\/avatar_user_4_1717572961-96x96.jpg","contentUrl":"https:\/\/pickl.ai\/blog\/wp-content\/uploads\/2024\/06\/avatar_user_4_1717572961-96x96.jpg","caption":"Neha Singh"},"description":"I\u2019m a full-time freelance writer and editor who enjoys wordsmithing. The 8 years long journey as a content writer and editor has made me relaize the significance and power of choosing the right words. Prior to my writing journey, I was a trainer and human resource manager. WIth more than a decade long professional journey, I find myself more powerful as a wordsmith. As an avid writer, everything around me inspires me and pushes me to string words and ideas to create unique content; and when I\u2019m not writing and editing, I enjoy experimenting with my culinary skills, reading, gardening, and spending time with my adorable little mutt Neel.","url":"https:\/\/www.pickl.ai\/blog\/author\/nehasingh\/"}]}},"jetpack_featured_media_url":"https:\/\/www.pickl.ai\/blog\/wp-content\/uploads\/2025\/05\/unnamed-4-2.png","authors":[{"term_id":2169,"user_id":4,"is_guest":0,"slug":"nehasingh","display_name":"Neha Singh","avatar_url":"https:\/\/pickl.ai\/blog\/wp-content\/uploads\/2024\/06\/avatar_user_4_1717572961-96x96.jpg","first_name":"Neha","user_url":"","last_name":"Singh","description":"I\u2019m a full-time freelance writer and editor who enjoys wordsmithing. The 8 years long journey as a content writer and editor has made me relaize the significance and power of choosing the right words. Prior to my writing journey, I was a trainer and human resource manager. WIth more than a decade long professional journey, I find myself more powerful as a wordsmith. As an avid writer, everything around me inspires me and pushes me to string words and ideas to create unique content; and when I\u2019m not writing and editing, I enjoy experimenting with my culinary skills, reading, gardening, and spending time with my adorable little mutt Neel."},{"term_id":2183,"user_id":18,"is_guest":0,"slug":"nitin-choudhary","display_name":"Nitin Choudhary","avatar_url":"https:\/\/pickl.ai\/blog\/wp-content\/uploads\/2023\/10\/avatar_user_18_1697616749-96x96.jpeg","first_name":"Nitin","user_url":"","last_name":"Choudhary","description":"I've been playing with data for a while now, and it's been pretty cool! I like turning all those numbers into pictures that tell stories. When I'm not doing that, I love running, meeting new people, and reading books. Running makes me feel great, meeting people is fun, and books are like my new favourite thing. It's not just about data; it's also about being active, making friends, and enjoying good stories. Come along and see how awesome the world of data can be!"}],"_links":{"self":[{"href":"https:\/\/www.pickl.ai\/blog\/wp-json\/wp\/v2\/posts\/22681","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pickl.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pickl.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pickl.ai\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pickl.ai\/blog\/wp-json\/wp\/v2\/comments?post=22681"}],"version-history":[{"count":1,"href":"https:\/\/www.pickl.ai\/blog\/wp-json\/wp\/v2\/posts\/22681\/revisions"}],"predecessor-version":[{"id":22694,"href":"https:\/\/www.pickl.ai\/blog\/wp-json\/wp\/v2\/posts\/22681\/revisions\/22694"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pickl.ai\/blog\/wp-json\/wp\/v2\/media\/22693"}],"wp:attachment":[{"href":"https:\/\/www.pickl.ai\/blog\/wp-json\/wp\/v2\/media?parent=22681"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pickl.ai\/blog\/wp-json\/wp\/v2\/categories?post=22681"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pickl.ai\/blog\/wp-json\/wp\/v2\/tags?post=22681"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.pickl.ai\/blog\/wp-json\/wp\/v2\/ppma_author?post=22681"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}