{"id":54981,"date":"2023-09-02T15:03:43","date_gmt":"2023-09-02T15:03:43","guid":{"rendered":"https:\/\/dbtut.com\/?p=54981"},"modified":"2023-09-02T15:04:43","modified_gmt":"2023-09-02T15:04:43","slug":"postgresql-coalesce","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2023\/09\/02\/postgresql-coalesce\/","title":{"rendered":"PostgreSQL Coalesce"},"content":{"rendered":"<p>In today&#8217;s article, I will be explaining What is PostgreSQL Coalesce and how to use it.<\/p>\n<p>The Coalesce function is used to replace a NULL value when querying data.<\/p>\n<p>The Coalesce function is similar to the isnull() parameter in mssql, but the ISNULL() function takes two parameters, while the COALESCE() function can take up to N parameters.<\/p>\n<p>EXAMPLE usage is as follows.<\/p>\n<pre class=\"lang:default decode:true \">select coalesce (NULL,1,2)\r\n<\/pre>\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"http:\/\/www.farukerdem.com\/wp-content\/uploads\/2020\/12\/coalesce1.png\" \/><\/p>\n<p>As seen above, we wrote NULL in the first value and wrote the value 1 in the second parameter, because the coalesce works from left to right, after seeing the NULL value, it took the first value and wrote 1 to the result.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"http:\/\/www.farukerdem.com\/wp-content\/uploads\/2020\/12\/coalesce2.png\" \/><\/p>\n<p id=\"BCVTQiW\">In the example above, if the vize is null in our students table, it is changed to 0.<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_54981\" class=\"pvc_stats all  \" data-element-id=\"54981\" 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>In today&#8217;s article, I will be explaining What is PostgreSQL Coalesce and how to use it. The Coalesce function is used to replace a NULL value when querying data. The Coalesce function is similar to the isnull() parameter in mssql, but the ISNULL() function takes two parameters, while the COALESCE() function can take up to &hellip;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_54981\" class=\"pvc_stats all  \" data-element-id=\"54981\" 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":366,"featured_media":54984,"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":[5],"tags":[],"class_list":["post-54981","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-postgres"],"aioseo_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - 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