{"id":74,"date":"2008-10-04T12:35:31","date_gmt":"2008-10-04T10:35:31","guid":{"rendered":"http:\/\/unckel.com\/blog\/?p=74"},"modified":"2019-12-07T22:28:44","modified_gmt":"2019-12-07T21:28:44","slug":"sql-datum-vorhanden-vergleich-mit-is-null","status":"publish","type":"post","link":"https:\/\/unckel.de\/blog\/sql-datum-vorhanden-vergleich-mit-is-null\/","title":{"rendered":"SQL: Datum vorhanden? &#8211; Vergleich mit IS NULL"},"content":{"rendered":"<p>Aufgepasst bei der Verwendung von <strong>NULL<\/strong> in Datum\/Zeit-Feldern. Nicht\u00a0<strong>NULL\u00a0<\/strong>sondern\u00a0<strong>IS NULL<\/strong>\u00a0verwenden:<\/p>\n<pre>SELECT *\nFROM Tab\nWHERE Date IS NULL<\/pre>\n<p>bzw.<\/p>\n<pre>SELECT *\nFROM Tab\nWHERE Date IS NULL<\/pre>\n<p>Mehr dazu:\u00a0<a href=\"http:\/\/www.teialehrbuch.de\/Kostenlose-Kurse\/SQL\/14731-Der-Vergleich-mit-dem-Wert-Null.html\" target=\"_blank\" rel=\"noopener\">http:\/\/www.teialehrbuch.de\/Kostenlose-Kurse\/SQL\/14731-Der-Vergleich-mit-dem-Wert-Null.html<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Aufgepasst bei der Verwendung von NULL in Datum\/Zeit-Feldern. Nicht\u00a0NULL\u00a0sondern\u00a0IS NULL\u00a0verwenden: SELECT * FROM Tab WHERE Date IS NULL bzw. SELECT * FROM Tab WHERE Date IS NULL Mehr dazu:\u00a0http:\/\/www.teialehrbuch.de\/Kostenlose-Kurse\/SQL\/14731-Der-Vergleich-mit-dem-Wert-Null.html &nbsp; &nbsp;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[71],"tags":[],"class_list":["post-74","post","type-post","status-publish","format-standard","hentry","category-webdesign"],"_links":{"self":[{"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/posts\/74","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/comments?post=74"}],"version-history":[{"count":1,"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/posts\/74\/revisions"}],"predecessor-version":[{"id":833,"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/posts\/74\/revisions\/833"}],"wp:attachment":[{"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/media?parent=74"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/categories?post=74"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/tags?post=74"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}