{"id":217,"date":"2023-08-03T11:04:08","date_gmt":"2023-08-03T03:04:08","guid":{"rendered":"https:\/\/www.zhukaifu.cn\/?p=217"},"modified":"2023-08-03T11:04:08","modified_gmt":"2023-08-03T03:04:08","slug":"mysql-substring_index","status":"publish","type":"post","link":"https:\/\/www.zhukaifu.cn\/?p=217","title":{"rendered":"mysql SUBSTRING_INDEX"},"content":{"rendered":"\n<p>\u4eca\u5929\u5199\u4e86\u4e2a\u65b0sql\u8bb0\u5f55\u4e00\u4e0b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT SUBSTRING_INDEX(\"www.zhukaifu.cn\", \".\", 1);\nwww\n<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>id_attr<\/td><td>attrs<\/td><\/tr><tr><td>1<\/td><td>123,456<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">attr\u8868<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>id<\/td><td>name<\/td><\/tr><tr><td>123<\/td><td>\u6d4b\u8bd5<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">name\u8868<\/figcaption><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT\n  *\nFROM\n  `name`\n  LEFT JOIN `attr` ON name.id = SUBSTRING_INDEX(attr.attrs, \",\", 1)\n\u53ef\u4ee5\u628aSUBSTRING_INDEX\u7528\u5728JOIN\u91cc\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u5929\u5199\u4e86\u4e2a\u65b0sql\u8bb0\u5f55\u4e00\u4e0b id_attr attrs 1 123,456 at&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":["post-217","post","type-post","status-publish","format-standard","hentry","category-code-2"],"_links":{"self":[{"href":"https:\/\/www.zhukaifu.cn\/index.php?rest_route=\/wp\/v2\/posts\/217","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zhukaifu.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zhukaifu.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zhukaifu.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zhukaifu.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=217"}],"version-history":[{"count":4,"href":"https:\/\/www.zhukaifu.cn\/index.php?rest_route=\/wp\/v2\/posts\/217\/revisions"}],"predecessor-version":[{"id":221,"href":"https:\/\/www.zhukaifu.cn\/index.php?rest_route=\/wp\/v2\/posts\/217\/revisions\/221"}],"wp:attachment":[{"href":"https:\/\/www.zhukaifu.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=217"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zhukaifu.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=217"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zhukaifu.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=217"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}