{"id":175273,"date":"2024-11-08T04:29:19","date_gmt":"2024-11-07T20:29:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/175273\/"},"modified":"2024-11-08T04:29:19","modified_gmt":"2024-11-07T20:29:19","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8mysql%e6%9b%b4%e6%96%b0%e8%a1%a8%e4%b8%ad%e7%9a%84%e8%a1%8c%e6%95%b8%e6%93%9a%ef%bc%9f-mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9b%b4%e6%96%b0%e8%a1%8c%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/175273\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528MySQL\u66f4\u65b0\u8868\u4e2d\u7684\u884c\u6578\u64da\uff1f (mysql\u6578\u64da\u5eab\u66f4\u65b0\u884c\u6578\u64da)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8mysql%e6%9b%b4%e6%96%b0%e8%a1%a8%e4%b8%ad%e7%9a%84%e8%a1%8c%e6%95%b8%e6%93%9a%ef%bc%9f-mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9b%b4%e6%96%b0%e8%a1%8c%e6%95%b8-vxHBMpYbVY\">\u5982\u4f55\u4f7f\u7528MySQL\u66f4\u65b0\u8868\u4e2d\u7684\u884c\u6578\u64da\uff1f (mysql\u6578\u64da\u5eab\u66f4\u65b0\u884c\u6578\u64da)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u66f4\u65b0\u8868\u4e2d\u7684\u884c\u6578\u64da\u662f\u4e00\u9805\u5e38\u898b\u7684\u64cd\u4f5c\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u66f4\u65b0\u6578\u64da\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528MySQL\u66f4\u65b0\u8868\u4e2d\u7684\u884c\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\uff0c\u4ee5\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u9019\u4e00\u904e\u7a0b\u3002<\/p>\n<h2 id=\"%e5%9f%ba%e6%9c%ac%e7%9a%84update%e8%aa%9e%e5%8f%a5-vxHBMpYbVY\">\u57fa\u672c\u7684UPDATE\u8a9e\u53e5<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u66f4\u65b0\u6578\u64da\u7684\u57fa\u672c\u8a9e\u6cd5\u662f\u4f7f\u7528<code>UPDATE<\/code>\u8a9e\u53e5\u3002\u5176\u57fa\u672c\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n<pre><code>UPDATE \u8868\u540d\nSET \u5217\u540d1 = \u503c1, \u5217\u540d2 = \u503c2, ...\nWHERE \u689d\u4ef6;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>\u8868\u540d<\/code>\u662f\u4f60\u60f3\u8981\u66f4\u65b0\u7684\u6578\u64da\u8868\u7684\u540d\u7a31\uff0c<code>\u5217\u540d<\/code>\u662f\u4f60\u60f3\u8981\u4fee\u6539\u7684\u5217\uff0c\u800c<code>\u503c<\/code>\u5247\u662f\u4f60\u5e0c\u671b\u8a2d\u7f6e\u7684\u65b0\u503c\u3002<code>WHERE<\/code>\u5b50\u53e5\u7528\u65bc\u6307\u5b9a\u54ea\u4e9b\u884c\u9700\u8981\u88ab\u66f4\u65b0\uff0c\u9019\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u56e0\u70ba\u5982\u679c\u7701\u7565\u4e86<code>WHERE<\/code>\u5b50\u53e5\uff0c\u5247\u6240\u6709\u884c\u90fd\u6703\u88ab\u66f4\u65b0\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e6%9b%b4%e6%96%b0%e5%96%ae%e8%a1%8c%e6%95%b8%e6%93%9a-vxHBMpYbVY\">\u793a\u4f8b\uff1a\u66f4\u65b0\u55ae\u884c\u6578\u64da<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>employees<\/code>\u7684\u8868\uff0c\u8a72\u8868\u5305\u542b\u54e1\u5de5\u7684\u59d3\u540d\u548c\u85aa\u6c34\u3002\u73fe\u5728\u6211\u5011\u60f3\u8981\u66f4\u65b0\u67d0\u4f4d\u54e1\u5de5\u7684\u85aa\u6c34\u3002\u4ee5\u4e0b\u662f\u5177\u9ad4\u7684SQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>UPDATE employees\nSET salary = 60000\nWHERE name = 'John Doe';<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u6703\u628a\u540d\u70ba\u201cJohn Doe\u201d\u7684\u54e1\u5de5\u7684\u85aa\u6c34\u66f4\u65b0\u70ba60000\u3002<\/p>\n<h2 id=\"%e6%9b%b4%e6%96%b0%e5%a4%9a%e8%a1%8c%e6%95%b8%e6%93%9a-vxHBMpYbVY\">\u66f4\u65b0\u591a\u884c\u6578\u64da<\/h2>\n<p>\u5982\u679c\u9700\u8981\u66f4\u65b0\u591a\u884c\u6578\u64da\uff0c\u53ef\u4ee5\u5728<code>WHERE<\/code>\u5b50\u53e5\u4e2d\u4f7f\u7528\u689d\u4ef6\u4f86\u9078\u64c7\u591a\u500b\u884c\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u60f3\u8981\u5c07\u6240\u6709\u85aa\u6c34\u4f4e\u65bc50000\u7684\u54e1\u5de5\u7684\u85aa\u6c34\u63d0\u9ad8\u523050000\uff1a<\/p>\n<pre><code>UPDATE employees\nSET salary = 50000\nWHERE salary &lt; 50000;<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u6240\u6709\u85aa\u6c34\u4f4e\u65bc50000\u7684\u54e1\u5de5\u90fd\u6703\u88ab\u66f4\u65b0\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8order-by%e5%92%8climit-vxHBMpYbVY\">\u4f7f\u7528ORDER BY\u548cLIMIT<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f60\u53ef\u80fd\u53ea\u60f3\u66f4\u65b0\u7279\u5b9a\u7684\u884c\uff0c\u4f8b\u5982\u6700\u65b0\u7684\u5e7e\u689d\u8a18\u9304\u3002\u9019\u6642\u53ef\u4ee5\u7d50\u5408\u4f7f\u7528<code>ORDER BY<\/code>\u548c<code>LIMIT<\/code>\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u60f3\u8981\u5c07\u6700\u65b0\u7684\u4e09\u4f4d\u54e1\u5de5\u7684\u85aa\u6c34\u63d0\u9ad810%\uff1a<\/p>\n<pre><code>UPDATE employees\nSET salary = salary * 1.1\nORDER BY hire_date DESC\nLIMIT 3;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u6703\u628a\u6700\u8fd1\u5165\u8077\u7684\u4e09\u4f4d\u54e1\u5de5\u7684\u85aa\u6c34\u63d0\u9ad810%\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-vxHBMpYbVY\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u5099\u4efd\u6578\u64da\uff1a<\/strong>\u5728\u9032\u884c\u66f4\u65b0\u64cd\u4f5c\u4e4b\u524d\uff0c\u5efa\u8b70\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u6578\u64da\u4e1f\u5931\u3002<\/li>\n<li><strong>\u6e2c\u8a66\u66f4\u65b0\uff1a<\/strong>\u5728\u751f\u7522\u74b0\u5883\u4e2d\u57f7\u884c\u66f4\u65b0\u4e4b\u524d\uff0c\u53ef\u4ee5\u5728\u6e2c\u8a66\u74b0\u5883\u4e2d\u5148\u9032\u884c\u6e2c\u8a66\uff0c\u4ee5\u78ba\u4fdd\u8a9e\u53e5\u7684\u6b63\u78ba\u6027\u3002<\/li>\n<li><strong>\u4f7f\u7528\u4e8b\u52d9\uff1a<\/strong>\u5c0d\u65bc\u91cd\u8981\u7684\u66f4\u65b0\u64cd\u4f5c\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e8b\u52d9\u4f86\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-vxHBMpYbVY\">\u7e3d\u7d50<\/h2>\n<p>\u4f7f\u7528MySQL\u66f4\u65b0\u8868\u4e2d\u7684\u884c\u6578\u64da\u662f\u4e00\u9805\u57fa\u672c\u800c\u91cd\u8981\u7684\u6280\u80fd\u3002\u901a\u904e\u638c\u63e1<code>UPDATE<\/code>\u8a9e\u53e5\u7684\u4f7f\u7528\uff0c\u4e26\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u9078\u64c7\u8981\u66f4\u65b0\u7684\u884c\uff0c\u60a8\u53ef\u4ee5\u9748\u6d3b\u5730\u7ba1\u7406\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u3002\u7121\u8ad6\u662f\u66f4\u65b0\u55ae\u884c\u9084\u662f\u591a\u884c\u6578\u64da\uff0c\u6b63\u78ba\u7684\u8a9e\u6cd5\u548c\u689d\u4ef6\u90fd\u80fd\u5e6b\u52a9\u60a8\u9054\u6210\u76ee\u6a19\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684MySQL\u6578\u64da\u5eab\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u7a69\u5b9a\u548c\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528MySQL\u66f4\u65b0\u8868\u4e2d\u7684\u884c\u6578\u64da\uff0c\u638c\u63e1UPDATE\u8a9e\u53e5\u7684\u7528\u6cd5\uff0c\u8f15\u9b06\u4fee\u6539\u6578\u64da\u5eab\u4e2d\u7684\u8a18\u9304\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-175273","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175273","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=175273"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175273\/revisions"}],"predecessor-version":[{"id":175274,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175273\/revisions\/175274"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=175273"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=175273"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=175273"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}