{"id":2960,"date":"2019-02-26T10:16:55","date_gmt":"2019-02-26T02:16:55","guid":{"rendered":"https:\/\/www.webteach.tw\/?p=2960"},"modified":"2019-02-26T10:16:55","modified_gmt":"2019-02-26T02:16:55","slug":"mysql-%e5%88%a9%e7%94%a8-mysql-length-%e5%87%bd%e5%bc%8f-%e5%88%aa%e9%99%a4%e9%87%8d%e8%a6%86%e6%ac%84%e4%bd%8d","status":"publish","type":"post","link":"https:\/\/www.webteach.tw\/?p=2960","title":{"rendered":"[ MySQL ] &#8211; \u5229\u7528 MySQL LENGTH() \u51fd\u5f0f \u522a\u9664\u91cd\u8986\u6b04\u4f4d"},"content":{"rendered":"\n\t\t\t\t\n<p class=\"wp-block-paragraph\">\u5229\u7528 MySQL LENGTH() \u51fd\u5f0f \u522a\u9664\u91cd\u8986\u6b04\u4f4d<br \/><br \/>\u6709\u6642\u5019\u6709\u4e9b\u6b04\u4f4d\u5167\u5bb9\u6709\u4e00\u5b9a\u7684\u898f\u5247\uff0c\u4f46\u6642\u7528\u8005\u8f38\u5165\u6642\u5f80\u5f80\u4e0d\u7167\u898f\u5247\u4f86\uff1b\u9020\u6210\u8981\u7d71\u8a08\u8cc7\u6599\u6642\u6703\u5931\u6e96\uff0c\u9019\u6642\u5019\u5c31\u53ef\u4ee5\u900f\u904e\u4e00\u4e9b\u6a5f\u5236\u4f86\u522a\u9664\u7121\u6548\u8cc7\u6599\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u822c\u4f86\u8aaa\u524d\u7aef\u8981\u5148\u64cb\uff0c\u5f8c\u7aef\u518d\u64cb\u4e00\u6b21\uff0c\u4f46\u6709\u6642\u5019\u6703\u5e0c\u671b\u4e0d\u8981\u64cb\u7684\u592a\u6b7b\u6703\u986f\u97ff\u5230\u4f7f\u7528\u8005\u7684\u8f38\u5165\u610f\u9858\uff08\u4e5f\u5c31\u662f\u6703\u9020\u6210\u4f7f\u7528\u8005\u64cd\u4f5c\u9ad4\u9a57\u4e0d\u4f73\uff09\u3002\u9019\u6b21\u7684\u4f8b\u5b50\u662f \u67d0\u500b\u6b04\u4f4d\u6700\u5c11\u8981\u8d85\u904e\u516d\u500b\u5b57\u5143\u4ee5\u4e0a\uff0c\u4e5f\u5c31\u662f\u8aaa\u516d\u500b\u5b57\u5143\u4ee5\u4e0b\u7684\u90fd\u7b97\u662f\u7121\u6548\u8cc7\u6599\u53ef\u4ee5\u522a\u9664\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u986f\u793a\u67d0\u6b04\u4f4d\u7684\u9577\u5ea6<\/strong><br \/><br \/>SELECT * , LENGTH( <code>column_name<\/code> ) AS a<br \/> FROM  <code>table_name<\/code> <br \/> WHERE 1 <br \/> ORDER BY  <code>a<\/code> ASC <\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u522a\u9664\u67d0\u6b04\u4f4d\u7684\u9577\u5ea6 \u5c0f\u65bc6\u7684\u8cc7\u6599<\/strong><br \/><br \/>DELETE FROM <code>LPN<\/code> WHERE LENGTH(  <code>column_name<\/code> ) &lt;6<br \/><\/p>\n\t\t","protected":false},"excerpt":{"rendered":"<p>\t\t\t\t\u6709\u6642\u5019\u6709\u4e9b\u6b04\u4f4d\u5167\u5bb9\u6709\u4e00\u5b9a\u7684\u898f\u5247\uff0c\u4f46\u6642\u7528\u8005\u8f38\u5165\u6642\u5f80\u5f80\u4e0d\u7167\u898f\u5247\u4f86\uff1b\u9020\u6210\u8981\u7d71\u8a08\u8cc7\u6599\u6642\u6703\u5931\u6e96\uff0c\u9019\u6642\u5019\u5c31\u53ef\u4ee5\u900f\u904e\u4e00\u4e9b\u6a5f\u5236\u4f86\u522a\u9664\u7121\u6548\u8cc7\u6599\u3002\t\t<\/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":[361,402],"class_list":["post-2960","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mysql","tag-length","tag-mysql","hvn-theme-has-thumbnail"],"_links":{"self":[{"href":"https:\/\/www.webteach.tw\/index.php?rest_route=\/wp\/v2\/posts\/2960","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=2960"}],"version-history":[{"count":0,"href":"https:\/\/www.webteach.tw\/index.php?rest_route=\/wp\/v2\/posts\/2960\/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=2960"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.webteach.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2960"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.webteach.tw\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2960"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}