{"id":76346,"date":"2024-10-16T05:54:15","date_gmt":"2024-10-15T21:54:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76346\/"},"modified":"2024-10-16T05:54:15","modified_gmt":"2024-10-15T21:54:15","slug":"mysql%e6%95%b8%e6%93%9a%e8%a1%a8%e4%b8%ad%e5%ad%97%e6%ae%b5%e7%9a%84%e6%89%b9%e9%87%8f%e4%bf%ae%e6%94%b9%e8%88%87%e8%a4%87%e8%a3%bd","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76346\/","title":{"rendered":"MySQL\u6578\u64da\u8868\u4e2d\u5b57\u6bb5\u7684\u6279\u91cf\u4fee\u6539\u8207\u8907\u88fd"},"content":{"rendered":"<h1 id=\"mysql%e6%95%b8%e6%93%9a%e8%a1%a8%e4%b8%ad%e5%ad%97%e6%ae%b5%e7%9a%84%e6%89%b9%e9%87%8f%e4%bf%ae%e6%94%b9%e8%88%87%e8%a4%87%e8%a3%bd-niwsEfDVzp\">MySQL\u6578\u64da\u8868\u4e2d\u5b57\u6bb5\u7684\u6279\u91cf\u4fee\u6539\u8207\u8907\u88fd<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u5c0d\u6578\u64da\u7684\u7ba1\u7406\u9700\u6c42\u4e5f\u96a8\u4e4b\u589e\u52a0\u3002\u7279\u5225\u662f\u5728\u9700\u8981\u5c0d\u6578\u64da\u8868\u4e2d\u7684\u5b57\u6bb5\u9032\u884c\u6279\u91cf\u4fee\u6539\u6216\u8907\u88fd\u6642\uff0c\u638c\u63e1\u76f8\u61c9\u7684\u6280\u5de7\u548c\u65b9\u6cd5\u986f\u5f97\u5c24\u70ba\u91cd\u8981\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728MySQL\u4e2d\u6709\u6548\u5730\u9032\u884c\u5b57\u6bb5\u7684\u6279\u91cf\u4fee\u6539\u8207\u8907\u88fd\u3002<\/p>\n<h2 id=\"%e4%b8%80%e3%80%81%e6%89%b9%e9%87%8f%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5-niwsEfDVzp\">\u4e00\u3001\u6279\u91cf\u4fee\u6539\u5b57\u6bb5<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u6279\u91cf\u4fee\u6539\u5b57\u6bb5\u901a\u5e38\u4f7f\u7528UPDATE\u8a9e\u53e5\u3002\u9019\u500b\u8a9e\u53e5\u5141\u8a31\u7528\u6236\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u66f4\u65b0\u591a\u689d\u8a18\u9304\u7684\u67d0\u500b\u6216\u67d0\u4e9b\u5b57\u6bb5\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>UPDATE \u8868\u540d SET \u5b57\u6bb51 = \u503c1, \u5b57\u6bb52 = \u503c2 WHERE \u689d\u4ef6;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba\u201cemployees\u201d\u7684\u8868\uff0c\u4e26\u5e0c\u671b\u5c07\u6240\u6709\u54e1\u5de5\u7684\u85aa\u6c34\u63d0\u9ad810%\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>UPDATE employees SET salary = salary * 1.1;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u6703\u66f4\u65b0\u201cemployees\u201d\u8868\u4e2d\u6240\u6709\u54e1\u5de5\u7684\u85aa\u6c34\uff0c\u7121\u9700\u9010\u4e00\u4fee\u6539\u3002<\/p>\n<h3 id=\"1-1-%e4%bd%bf%e7%94%a8case%e8%aa%9e%e5%8f%a5%e9%80%b2%e8%a1%8c%e6%a2%9d%e4%bb%b6%e6%9b%b4%e6%96%b0-niwsEfDVzp\">1.1 \u4f7f\u7528CASE\u8a9e\u53e5\u9032\u884c\u689d\u4ef6\u66f4\u65b0<\/h3>\n<p>\u5982\u679c\u9700\u8981\u6839\u64da\u4e0d\u540c\u7684\u689d\u4ef6\u5c0d\u5b57\u6bb5\u9032\u884c\u4e0d\u540c\u7684\u4fee\u6539\uff0c\u53ef\u4ee5\u4f7f\u7528CASE\u8a9e\u53e5\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u5e0c\u671b\u6839\u64da\u54e1\u5de5\u7684\u8077\u4f4d\u4f86\u8abf\u6574\u85aa\u6c34\uff1a<\/p>\n<pre><code>UPDATE employees SET salary = CASE \n    WHEN position = 'Manager' THEN salary * 1.2\n    WHEN position = 'Developer' THEN salary * 1.15\n    ELSE salary\nEND;<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u6839\u64da\u4e0d\u540c\u7684\u8077\u4f4d\u5c0d\u85aa\u6c34\u9032\u884c\u4e0d\u540c\u7684\u8abf\u6574\u3002<\/p>\n<h2 id=\"%e4%ba%8c%e3%80%81%e6%89%b9%e9%87%8f%e8%a4%87%e8%a3%bd%e5%ad%97%e6%ae%b5-niwsEfDVzp\">\u4e8c\u3001\u6279\u91cf\u8907\u88fd\u5b57\u6bb5<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u5c07\u4e00\u500b\u5b57\u6bb5\u7684\u503c\u8907\u88fd\u5230\u53e6\u4e00\u500b\u5b57\u6bb5\u3002\u9019\u53ef\u4ee5\u901a\u904eUPDATE\u8a9e\u53e5\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>UPDATE \u8868\u540d SET \u76ee\u6a19\u5b57\u6bb5 = \u6e90\u5b57\u6bb5 WHERE \u689d\u4ef6;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u5e0c\u671b\u5c07\u201cemployees\u201d\u8868\u4e2d\u7684\u201cemail\u201d\u5b57\u6bb5\u7684\u503c\u8907\u88fd\u5230\u201cbackup_email\u201d\u5b57\u6bb5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>UPDATE employees SET backup_email = email;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u6703\u5c07\u6240\u6709\u54e1\u5de5\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u8907\u88fd\u5230\u5099\u4efd\u5b57\u6bb5\u4e2d\u3002<\/p>\n<h3 id=\"2-1-%e4%bd%bf%e7%94%a8select%e8%aa%9e%e5%8f%a5%e9%80%b2%e8%a1%8c%e8%a4%87%e8%a3%bd-niwsEfDVzp\">2.1 \u4f7f\u7528SELECT\u8a9e\u53e5\u9032\u884c\u8907\u88fd<\/h3>\n<p>\u5982\u679c\u9700\u8981\u5f9e\u53e6\u4e00\u500b\u8868\u4e2d\u8907\u88fd\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528JOIN\u8a9e\u53e5\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u201cdepartments\u201d\u8868\uff0c\u4e26\u5e0c\u671b\u5c07\u90e8\u9580\u540d\u7a31\u8907\u88fd\u5230\u201cemployees\u201d\u8868\u4e2d\u7684\u201cdepartment_name\u201d\u5b57\u6bb5\uff1a<\/p>\n<pre><code>UPDATE employees e\nJOIN departments d ON e.department_id = d.id\nSET e.department_name = d.name;<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u6839\u64da\u90e8\u9580ID\u5c07\u90e8\u9580\u540d\u7a31\u8907\u88fd\u5230\u54e1\u5de5\u8868\u4e2d\u3002<\/p>\n<h2 id=\"%e4%b8%89%e3%80%81%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-niwsEfDVzp\">\u4e09\u3001\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u5728\u9032\u884c\u6279\u91cf\u4fee\u6539\u6216\u8907\u88fd\u4e4b\u524d\uff0c\u5efa\u8b70\u5148\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u640d\u5931\u3002<\/li>\n<li>\u5728\u57f7\u884cUPDATE\u8a9e\u53e5\u6642\uff0c\u52d9\u5fc5\u78ba\u8a8dWHERE\u689d\u4ef6\u7684\u6b63\u78ba\u6027\uff0c\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u66f4\u6539\u3002<\/li>\n<li>\u5c0d\u65bc\u5927\u578b\u6578\u64da\u8868\uff0c\u5efa\u8b70\u5206\u6279\u6b21\u9032\u884c\u66f4\u65b0\uff0c\u4ee5\u6e1b\u5c11\u5c0d\u6578\u64da\u5eab\u6027\u80fd\u7684\u5f71\u97ff\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-niwsEfDVzp\">\u7e3d\u7d50<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u6279\u91cf\u4fee\u6539\u8207\u8907\u88fd\u5b57\u6bb5\u662f\u6578\u64da\u7ba1\u7406\u4e2d\u5e38\u898b\u7684\u64cd\u4f5c\u3002\u901a\u904e\u4f7f\u7528UPDATE\u8a9e\u53e5\u53ca\u5176\u8b8a\u9ad4\uff0c\u80fd\u5920\u9ad8\u6548\u5730\u8655\u7406\u5927\u91cf\u6578\u64da\u3002\u7121\u8ad6\u662f\u9032\u884c\u85aa\u6c34\u8abf\u6574\u9084\u662f\u6578\u64da\u5099\u4efd\uff0c\u638c\u63e1\u9019\u4e9b\u6280\u5de7\u90fd\u80fd\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002\u82e5\u60a8\u9700\u8981\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u5728\u9999\u6e2f\u7684\u74b0\u5883\u4e2d\u4f7f\u7528MySQL\uff0c\u6216\u5c0b\u627e\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728MySQL\u6578\u64da\u8868\u4e2d\u6279\u91cf\u4fee\u6539\u548c\u8907\u88fd\u5b57\u6bb5\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u7c21\u5316\u64cd\u4f5c\u6d41\u7a0b\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-76346","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76346","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=76346"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76346\/revisions"}],"predecessor-version":[{"id":76347,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76346\/revisions\/76347"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76346"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76346"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}