{"id":80138,"date":"2024-10-16T13:59:55","date_gmt":"2024-10-16T05:59:55","guid":{"rendered":"https:\/\/server.hk\/cnblog\/80138\/"},"modified":"2024-10-16T13:59:55","modified_gmt":"2024-10-16T05:59:55","slug":"mysql%e6%8c%87%e4%bb%a4-update%ef%bc%88%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/80138\/","title":{"rendered":"MySQL\u6307\u4ee4: UPDATE\uff08\u66f4\u65b0\u6578\u64da\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-update%ef%bc%88%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a%ef%bc%89-nUoeepoHhT\">MySQL\u6307\u4ee4: UPDATE\uff08\u66f4\u65b0\u6578\u64da\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5176\u63d0\u4f9b\u7684\u5404\u7a2e\u6307\u4ee4\u4f7f\u5f97\u6578\u64da\u7684\u64cd\u4f5c\u8b8a\u5f97\u7c21\u55ae\u800c\u9ad8\u6548\u3002\u5176\u4e2d\uff0c<code>UPDATE<\/code>\u6307\u4ee4\u662f\u7528\u4f86\u66f4\u65b0\u5df2\u5b58\u5728\u6578\u64da\u7684\u91cd\u8981\u5de5\u5177\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e<code>UPDATE<\/code>\u6307\u4ee4\u7684\u7528\u6cd5\u3001\u8a9e\u6cd5\u53ca\u5176\u6ce8\u610f\u4e8b\u9805\u3002<\/p>\n<h2 id=\"update%e6%8c%87%e4%bb%a4%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-nUoeepoHhT\">UPDATE\u6307\u4ee4\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p><code>UPDATE<\/code>\u6307\u4ee4\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>UPDATE \u8868\u540d\nSET \u52171 = \u503c1, \u52172 = \u503c2, ...\nWHERE \u689d\u4ef6;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<strong>\u8868\u540d<\/strong>\u662f\u8981\u66f4\u65b0\u7684\u6578\u64da\u8868\uff0c<strong>\u52171, \u52172<\/strong>\u662f\u9700\u8981\u66f4\u65b0\u7684\u5217\uff0c\u800c<strong>\u503c1, \u503c2<\/strong>\u5247\u662f\u65b0\u7684\u6578\u64da\u503c\u3002<strong>WHERE<\/strong>\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=\"update%e6%8c%87%e4%bb%a4%e7%9a%84%e5%af%a6%e9%9a%9b%e7%af%84%e4%be%8b-nUoeepoHhT\">UPDATE\u6307\u4ee4\u7684\u5be6\u969b\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff0c\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\uff1a<\/p>\n<pre><code>UPDATE employees\nSET salary = 50000\nWHERE name = 'John';<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5c07\u540d\u70ba\u201cJohn\u201d\u7684\u54e1\u5de5\u7684\u85aa\u6c34\u66f4\u65b0\u70ba50000\u3002\u5982\u679c\u6211\u5011\u60f3\u8981\u66f4\u65b0\u591a\u500b\u5217\uff0c\u53ef\u4ee5\u9019\u6a23\u505a\uff1a<\/p>\n<pre><code>UPDATE employees\nSET salary = 55000, position = 'Manager'\nWHERE name = 'John';<\/code><\/pre>\n<h2 id=\"%e4%bd%bf%e7%94%a8update%e6%8c%87%e4%bb%a4%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-nUoeepoHhT\">\u4f7f\u7528UPDATE\u6307\u4ee4\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u5099\u4efd\u6578\u64da\uff1a<\/strong>\u5728\u9032\u884c\u4efb\u4f55\u66f4\u65b0\u64cd\u4f5c\u4e4b\u524d\uff0c\u5efa\u8b70\u5148\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u6578\u64da\u4e1f\u5931\u3002<\/li>\n<li><strong>\u4f7f\u7528WHERE\u5b50\u53e5\uff1a<\/strong>\u59cb\u7d42\u4f7f\u7528<code>WHERE<\/code>\u5b50\u53e5\u4f86\u9650\u5236\u66f4\u65b0\u7684\u7bc4\u570d\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5168\u8868\u66f4\u65b0\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\u6307\u4ee4\u7684\u6b63\u78ba\u6027\u3002<\/li>\n<li><strong>\u4e8b\u52d9\u8655\u7406\uff1a<\/strong>\u5728\u9700\u8981\u591a\u500b\u66f4\u65b0\u64cd\u4f5c\u7684\u60c5\u6cc1\u4e0b\uff0c\u8003\u616e\u4f7f\u7528\u4e8b\u52d9\u4f86\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"update%e6%8c%87%e4%bb%a4%e7%9a%84%e9%80%b2%e9%9a%8e%e7%94%a8%e6%b3%95-nUoeepoHhT\">UPDATE\u6307\u4ee4\u7684\u9032\u968e\u7528\u6cd5<\/h2>\n<p>\u9664\u4e86\u57fa\u672c\u7684\u66f4\u65b0\u64cd\u4f5c\uff0c<code>UPDATE<\/code>\u6307\u4ee4\u9084\u53ef\u4ee5\u8207\u5176\u4ed6MySQL\u529f\u80fd\u7d50\u5408\u4f7f\u7528\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b50\u67e5\u8a62\u4f86\u66f4\u65b0\u6578\u64da\uff1a<\/p>\n<pre><code>UPDATE employees\nSET salary = (SELECT AVG(salary) FROM employees)\nWHERE position = 'Intern';<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5c07\u6240\u6709\u5be6\u7fd2\u751f\u7684\u85aa\u6c34\u66f4\u65b0\u70ba\u6240\u6709\u54e1\u5de5\u85aa\u6c34\u7684\u5e73\u5747\u503c\u3002\u9019\u7a2e\u7528\u6cd5\u5728\u9700\u8981\u6839\u64da\u5176\u4ed6\u6578\u64da\u9032\u884c\u8a08\u7b97\u6642\u975e\u5e38\u6709\u7528\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-nUoeepoHhT\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7684<code>UPDATE<\/code>\u6307\u4ee4\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u6709\u6548\u5730\u66f4\u65b0\u6578\u64da\u3002\u901a\u904e\u6b63\u78ba\u7684\u8a9e\u6cd5\u548c\u6ce8\u610f\u4e8b\u9805\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u5b89\u5168\u5730\u9032\u884c\u6578\u64da\u66f4\u65b0\u64cd\u4f5c\u3002\u7121\u8ad6\u662f\u5728\u958b\u767c\u9084\u662f\u751f\u7522\u74b0\u5883\u4e2d\uff0c\u638c\u63e1<code>UPDATE<\/code>\u6307\u4ee4\u7684\u4f7f\u7528\u90fd\u662f\u6578\u64da\u5eab\u7ba1\u7406\u7684\u91cd\u8981\u6280\u80fd\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\u4eab\u53d7\u7a69\u5b9a\u548c\u5b89\u5168\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4UPDATE\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u66f4\u65b0\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u5eab\u7ba1\u7406\u6548\u7387\uff0c\u78ba\u4fdd\u6578\u64da\u6e96\u78ba\u6027\u8207\u4e00\u81f4\u6027\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-80138","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80138","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=80138"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80138\/revisions"}],"predecessor-version":[{"id":80139,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80138\/revisions\/80139"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=80138"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=80138"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=80138"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}