{"id":8546,"date":"2024-03-14T08:16:56","date_gmt":"2024-03-14T08:16:56","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-sql-identity\/"},"modified":"2025-08-03T06:24:21","modified_gmt":"2025-08-03T06:24:21","slug":"what-is-the-usage-of-sql-identity","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-sql-identity\/","title":{"rendered":"SQL IDENTITY: Auto-Increment Guide"},"content":{"rendered":"<p>In SQL, IDENTIY is a property used to automatically generate a unique incrementing numerical value for a specific column in a table when inserting new records.IDENTITY can be applied to integer columns to ensure each inserted record has a unique identifier.<\/p>\n<p>When using the IDENTITY property, it is necessary to specify its starting value, increment value, and maximum value. For example, when creating a table, you can use the following syntax to define a column with the IDENTITY property:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> TableName (\r\n    IDColumn <span class=\"hljs-type\">INT<\/span> <span class=\"hljs-keyword\">IDENTITY<\/span>(<span class=\"hljs-number\">1<\/span>,<span class=\"hljs-number\">1<\/span>) <span class=\"hljs-keyword\">PRIMARY<\/span> KEY,\r\n    OtherColumn <span class=\"hljs-type\">VARCHAR<\/span>(<span class=\"hljs-number\">50<\/span>)\r\n);\r\n<\/code><\/pre>\n<p>The example above creates a table called TableName, with a column called IDColumn, which is an integer type auto-incrementing column and is specified as a primary key. IDENTITY(1,1) indicates that the column will start auto-incrementing from 1, increasing by 1 each time.<\/p>\n<p>When inserting a new record, you don&#8217;t need to provide a value for the IDColumn, as the database will automatically generate a unique identifier for it. For example:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> TableName (OtherColumn) <span class=\"hljs-keyword\">VALUES<\/span> (<span class=\"hljs-string\">'Value1'<\/span>);\r\n<\/code><\/pre>\n<p>When executing the above statement, the database will automatically generate a unique value for the IDColumn, ensuring that each inserted record has a distinct identifier.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In SQL, IDENTIY is a property used to automatically generate a unique incrementing numerical value for a specific column in a table when inserting new records.IDENTITY can be applied to integer columns to ensure each inserted record has a unique identifier. When using the IDENTITY property, it is necessary to specify its starting value, increment [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[2680,284,1508,11588,11589],"class_list":["post-8546","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-auto-increment","tag-database","tag-primary-key","tag-sql-identity","tag-unique-identifier"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SQL IDENTITY: Auto-Increment Guide - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how SQL IDENTITY auto-generates unique incrementing numbers for columns. Guide with syntax and examples.\" \/>\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.silicloud.com\/blog\/what-is-the-usage-of-sql-identity\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL IDENTITY: Auto-Increment Guide\" \/>\n<meta property=\"og:description\" content=\"Learn how SQL IDENTITY auto-generates unique incrementing numbers for columns. 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