{"id":9192,"date":"2019-02-06T14:07:35","date_gmt":"2019-02-06T14:07:35","guid":{"rendered":"https:\/\/dbtut.com\/?p=9192"},"modified":"2019-02-08T06:59:55","modified_gmt":"2019-02-08T06:59:55","slug":"sql-server-cursor","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2019\/02\/06\/sql-server-cursor\/","title":{"rendered":"SQL Server Cursor"},"content":{"rendered":"<p>Hello there,<\/p>\n<p>A query operation is performed on SQL Server. If the cursor is on the line, the data in that line is processed.<\/p>\n<p>DML (insert &#8211; update &#8211; delete) operations to be performed on large tables in databases with intense transaction are very risky.<\/p>\n<p>Therefore, the cursor should be used in DML operations.<\/p>\n<p>Example,<\/p>\n<div class=\"line number1 index0 alt2\">\n<pre class=\"lang:tsql decode:true  \">declare @ID varchar(20)\n\u00a0\ndeclare cursorSK cursor for\n\u00a0\nSELECT birthdate\n\u00a0\u00a0FROM users where birthdate='2050-01-01 00:00:00.000'\n\u00a0\n\u00a0\n\u00a0\u00a0\u00a0OPEN cursorSK\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0FETCH NEXT FROM cursorSK\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0INTO @ID\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0WHILE @@FETCH_STATUS = 0\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0BEGIN\n\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0--here we can do the process we want the records returned by the row line query.\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0-- Exp:\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0update users set birthdate=null where birthdate=@ID\u00a0 --we are updating the birthdate variables from the above query result to null.\u00a0\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0FETCH NEXT FROM cursorSK INTO @ID\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0END\n\u00a0\n\u00a0\u00a0\u00a0CLOSE cursorSK\n\u00a0\nDEALLOCATE cursorSK<\/pre>\n<p><code class=\"sql keyword\"><code class=\"sql keyword\"><\/code><\/code><\/p>\n<p><code class=\"sql keyword\"><\/code><code class=\"sql plain\"><\/code><\/p>\n<\/div>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_9192\" class=\"pvc_stats all  \" data-element-id=\"9192\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/dbtut.com\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Hello there, A query operation is performed on SQL Server. If the cursor is on the line, the data in that line is processed. DML (insert &#8211; update &#8211; delete) operations to be performed on large tables in databases with intense transaction are very risky. Therefore, the cursor should be used in DML operations. Example, &hellip;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_9192\" class=\"pvc_stats all  \" data-element-id=\"9192\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/dbtut.com\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"author":398,"featured_media":0,"comment_status":"open","ping_status":"open","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,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[3,1596],"tags":[511,1937,1936,1550,1935],"class_list":["post-9192","post","type-post","status-publish","format-standard","","category-mssql","category-tsql","tag-cursor","tag-dml","tag-mssql","tag-sql","tag-tsql"],"aioseo_notices":[],"a3_pvc":{"activated":true,"total_views":127,"today_views":0},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SQL Server Cursor - Database Tutorials<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dbtut.com\/index.php\/2019\/02\/06\/sql-server-cursor\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL Server Cursor - Database Tutorials\" \/>\n<meta property=\"og:description\" content=\"Hello there, A query operation is performed on SQL Server. 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