{"id":2717,"date":"2018-11-06T17:29:19","date_gmt":"2018-11-06T09:29:19","guid":{"rendered":"https:\/\/www.webteach.tw\/?p=2717"},"modified":"2018-11-06T17:29:19","modified_gmt":"2018-11-06T09:29:19","slug":"mysql-is-null-is-not-null-%e5%88%a4%e6%96%b7%e6%ac%84%e4%bd%8d%e6%98%af%e5%90%a6%e7%82%ba%e7%a9%ba","status":"publish","type":"post","link":"https:\/\/www.webteach.tw\/?p=2717","title":{"rendered":"[ Mysql  ] &#8211; is null \/ is not null \u5224\u65b7\u6b04\u4f4d\u662f\u5426\u70ba\u7a7a"},"content":{"rendered":"<p>\t\t\t\tis null \/ is not null \u5224\u65b7\u6b04\u4f4d\u662f\u5426\u70ba\u7a7a<br \/>\n\u8a71\u8aaa\u7d66\u6b04\u4f4d\u8a2dnull\u503c\u9084\u6eff\u5c11\u7528\u5230\u7684\uff0c\u4e3b\u56e0\u662f\u6015\u8cc7\u6599\u8f49\u63db\u6703\u6709\u554f\u984c\uff1b\u4f46\u6700\u8fd1\u5347\u7d1a\u4e3b\u6a5f\u7528\u7684\u662f5.7,\u5df2\u7d93\u4e0d\u80fd\u585e\u7a7a\u5b57\u4e32\u4e86\u3002<br \/>\n\u53ea\u597d\u5c07\u6b04\u4f4d\u7d66\u4e88\u9810\u8a2d\u503c\u70banull, \u9019\u6a23\u4e4b\u524d\u5beb\u7684\u5224\u65b7\u662f\u5426\u70ba\u7a7a\u5b57\u4e32\u7684 sql \u8a9e\u6cd5\u5c31\u901a\u901a\u5931\u6548\u4e86\uff0c\u6539\u6210\u4ee5\u4e0b\u9019\u6a23\u3002<!--more--><br \/>\nselect * from table where col is null;<br \/>\nselect * from table where col is not null;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>is null \/ is not null \u5224\u65b7\u6b04&#8230;<\/p>\n","protected":false},"author":1,"featured_media":1867,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34],"tags":[317,333,402,422],"class_list":["post-2717","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mysql","tag-in-not-null","tag-is-null","tag-mysql","tag-null","hvn-theme-has-thumbnail"],"_links":{"self":[{"href":"https:\/\/www.webteach.tw\/index.php?rest_route=\/wp\/v2\/posts\/2717","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.webteach.tw\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.webteach.tw\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.webteach.tw\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.webteach.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2717"}],"version-history":[{"count":0,"href":"https:\/\/www.webteach.tw\/index.php?rest_route=\/wp\/v2\/posts\/2717\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.webteach.tw\/index.php?rest_route=\/wp\/v2\/media\/1867"}],"wp:attachment":[{"href":"https:\/\/www.webteach.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2717"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.webteach.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2717"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.webteach.tw\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2717"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}