{"id":10836,"date":"2023-12-02T14:58:40","date_gmt":"2023-12-02T06:58:40","guid":{"rendered":"http:\/\/xinyiworld.top\/wordpress_it\/?p=10836"},"modified":"2024-09-26T13:40:02","modified_gmt":"2024-09-26T05:40:02","slug":"sql%e8%af%ad%e6%b3%95","status":"publish","type":"post","link":"http:\/\/xinyiworld.top\/wordpress_it\/?p=10836","title":{"rendered":"SQL\u8bed\u6cd5"},"content":{"rendered":"<p><a href=\"https:\/\/c.biancheng.net\/sql\/create-table.html\">https:\/\/c.biancheng.net\/sql\/create-table.html<\/a><\/p>\n<h2>\u57fa\u672c\u8bed\u6cd5<\/h2>\n<ul>\n<li>\u6e05\u7a7a\u8868\u7684\u67d0\u4e2a\u5b57\u6bb5\n<pre><code class=\"language-sql\">UPDATE your_table_name\nSET your_column_name = &#039;&#039;\nWHERE some_other_column = &#039;some_value&#039;;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h2>SQL\u8bed\u6cd5\u7ecf\u9a8c\u79ef\u7d2f<\/h2>\n<ul>\n<li>\n<p>sql where like %% \u5f53\u5b57\u6bb5\u4e3anull\u65f6\u65e0\u6cd5\u68c0\u7d22\u5230<br \/>\n\u4f7f\u7528COALESCE\u51fd\u6570\u5c06NULL\u66ff\u6362\u4e3a\u7a7a\u5b57\u7b26\u4e32\uff0c\u7136\u540e\u8fdb\u884c\u5339\u914d<br \/>\n<code>SELECT * FROM table_name WHERE COALESCE(column, &#039;&#039;) LIKE &#039;%pattern%&#039;;<\/code><\/p>\n<\/li>\n<li>\n<p>\u591a\u7ea7\u6392\u5e8f<br \/>\n<code>db.Order(&quot;FirstField ASC, SecondField ASC&quot;)<\/code><br \/>\n\u6211\u4eec\u9996\u5148\u901a\u8fc7Order\u65b9\u6cd5\u6309\u7167FirstField\u5b57\u6bb5\u5347\u5e8f\u6392\u5e8f\uff0c\u7136\u540e\u5728\u6b64\u57fa\u7840\u4e0a\u901a\u8fc7\u9017\u53f7\u5206\u9694\uff0c\u6dfb\u52a0\u7b2c\u4e8c\u4e2a\u6392\u5e8f\u6761\u4ef6SecondField\u5b57\u6bb5\u5347\u5e8f\u6392\u5e8f\uff0c\u4ee5\u5b9e\u73b0\u4e8c\u7ea7\u6392\u5e8f\u3002\u8fd9\u6837\uff0c\u67e5\u8be2\u7ed3\u679c\u9996\u5148\u6309FirstField\u6392\u5e8f\uff0c\u5982\u679c\u6709\u76f8\u540c\u7684FirstField\u503c\uff0c\u5219\u4f1a\u6309SecondField\u6392\u5e8f\u3002<\/p>\n<\/li>\n<\/ul>\n<button class=\"simplefavorite-button\" data-postid=\"10836\" data-siteid=\"1\" data-groupid=\"1\" data-favoritecount=\"0\" style=\"\">\u6536\u85cf <i class=\"sf-icon-star-empty\"><\/i><\/button>","protected":false},"excerpt":{"rendered":"<p>https:\/\/c.biancheng.net\/sql\/create-table.html \u57fa\u672c\u8bed\u6cd5 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[857],"tags":[],"_links":{"self":[{"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=\/wp\/v2\/posts\/10836"}],"collection":[{"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10836"}],"version-history":[{"count":4,"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=\/wp\/v2\/posts\/10836\/revisions"}],"predecessor-version":[{"id":14791,"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=\/wp\/v2\/posts\/10836\/revisions\/14791"}],"wp:attachment":[{"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10836"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}