{"id":6525,"date":"2018-12-12T20:00:07","date_gmt":"2018-12-12T20:00:07","guid":{"rendered":"https:\/\/dbtut.com\/?p=6525"},"modified":"2018-12-21T13:12:55","modified_gmt":"2018-12-21T13:12:55","slug":"random-data-selectiontablesample","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2018\/12\/12\/random-data-selectiontablesample\/","title":{"rendered":"Random Data Selection(TABLESAMPLE)"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p>Did you know that TABLESAMPLE can be used after FROM to select random data from a table?<\/p>\n<p><strong>For example you can use the following:\u00a0<\/strong><\/p>\n<pre class=\"lang:default decode:true \">SELECT * FROM Sales.SalesOrderDetail TABLESAMPLE SYSTEM (2 PERCENT)<\/pre>\n<p>This command is quite unstable. When you run this query to return 2% of the records in the table, a different number of results will be returned each time.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>You can also use this command in the following way:<\/strong><\/p>\n<pre class=\"lang:default decode:true\">SELECT * FROM Sales.SalesOrderDetail TABLESAMPLE SYSTEM (500 rows)<\/pre>\n<p>But this query will not return 500 records. It will return between 300 and 800 records.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Another use is as follows:<\/strong><\/p>\n<pre class=\"lang:default decode:true\">SELECT * FROM Sales.SalesOrderDetail TABLESAMPLE SYSTEM (500 rows) REPEATABLE (123456)<\/pre>\n<p>With REPEATABLE option, you can specify a &#8220;bigint&#8221; value. So that the query returns the same result every time. But the result set returned by the query will change when the records in the table are changed or the bigint value that you specify changes.<\/p>\n<p>If an INSERT, UPDATE, DELETE, or Index Rebuilding operation is performed, a different set will return even if the value you give in REPEATABLE is the same.<\/p>\n\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_6525\" class=\"pvc_stats all  \" data-element-id=\"6525\" 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>&nbsp; Did you know that TABLESAMPLE can be used after FROM to select random data from a table? For example you can use the following:\u00a0 SELECT * FROM Sales.SalesOrderDetail TABLESAMPLE SYSTEM (2 PERCENT) This command is quite unstable. When you run this query to return 2% of the records in the table, a different number &hellip;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_6525\" class=\"pvc_stats all  \" data-element-id=\"6525\" 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":423,"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],"tags":[],"class_list":["post-6525","post","type-post","status-publish","format-standard","","category-mssql"],"aioseo_notices":[],"a3_pvc":{"activated":true,"total_views":132,"today_views":0},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - 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