{"id":23,"date":"2005-11-15T04:00:00","date_gmt":"2005-11-15T04:00:00","guid":{"rendered":"http:\/\/thenoyes.com\/littlenoise\/?p=23"},"modified":"2006-06-16T20:58:51","modified_gmt":"2006-06-16T20:58:51","slug":"distinct-count","status":"publish","type":"post","link":"https:\/\/thenoyes.com\/littlenoise\/?p=23","title":{"rendered":"Distinct Count"},"content":{"rendered":"<pre>\r\nSELECT COUNT(DISTINCT someField) FROM someTable;\r\nSELECT DISTINCT someField FROM someTable;\r\n<\/pre>\n<p>\nT\/F: The value returned by the first will always equal the number of rows returned by the second.<br \/>\n<spoiler 'Show Answer' 'Hide Answer'><br \/>\nAnswer: False.  COUNT() doesn&#8217;t count NULL, but SELECT DISTINCT will return a NULL.  So the query using COUNT() could return one less row than the number of rows found with DISTINCT.<\/spoiler><\/p>\n","protected":false},"excerpt":{"rendered":"<p>SELECT COUNT(DISTINCT someField) FROM someTable; SELECT DISTINCT someField FROM someTable; T\/F: The value returned by the first will always equal the number of rows returned by the second. Answer: False. COUNT() doesn&#8217;t count NULL, but SELECT DISTINCT will return a NULL. So the query using COUNT() could return one less row than the number of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[6],"tags":[],"class_list":["post-23","post","type-post","status-publish","format-standard","hentry","category-gotchas"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2IBF1-n","jetpack_sharing_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=\/wp\/v2\/posts\/23","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=23"}],"version-history":[{"count":0,"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=\/wp\/v2\/posts\/23\/revisions"}],"wp:attachment":[{"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=23"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=23"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=23"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}