{"id":144149,"date":"2024-11-01T08:58:18","date_gmt":"2024-11-01T00:58:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/144149\/"},"modified":"2024-11-01T08:58:19","modified_gmt":"2024-11-01T00:58:19","slug":"update-%e5%9c%a8-db2-%e7%ad%89%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e5%af%ab%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/144149\/","title":{"rendered":"UPDATE \u5728 DB2 \u7b49\u6578\u64da\u5eab\u4e2d\u7684\u5beb\u6cd5"},"content":{"rendered":"<h1 id=\"update-%e5%9c%a8-db2-%e7%ad%89%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e5%af%ab%e6%b3%95-RPDDMVrhPU\">UPDATE \u5728 DB2 \u7b49\u6578\u64da\u5eab\u4e2d\u7684\u5beb\u6cd5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cUPDATE \u8a9e\u53e5\u662f\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684 SQL \u8a9e\u53e5\uff0c\u7528\u65bc\u4fee\u6539\u5df2\u5b58\u5728\u7684\u6578\u64da\u3002DB2 \u4f5c\u70ba IBM \u7684\u4e00\u6b3e\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u63a2\u8a0e\u5728 DB2 \u4e2d\u4f7f\u7528 UPDATE \u8a9e\u53e5\u7684\u57fa\u672c\u8a9e\u6cd5\u3001\u6ce8\u610f\u4e8b\u9805\u4ee5\u53ca\u4e00\u4e9b\u5be6\u969b\u7684\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"update-%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-RPDDMVrhPU\">UPDATE \u8a9e\u53e5\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728 DB2 \u4e2d\uff0cUPDATE \u8a9e\u53e5\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\u4fee\u6539\u7684\u5217\uff0c\u800c<strong>\u503c1, \u503c2<\/strong> \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\u6c92\u6709 WHERE \u5b50\u53e5\uff0c\u6240\u6709\u884c\u90fd\u6703\u88ab\u66f4\u65b0\u3002<\/p>\n<h2 id=\"update-%e8%aa%9e%e5%8f%a5%e7%9a%84%e7%af%84%e4%be%8b-RPDDMVrhPU\">UPDATE \u8a9e\u53e5\u7684\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 <strong>employees<\/strong> \u7684\u8868\uff0c\u5305\u542b\u54e1\u5de5\u7684\u57fa\u672c\u4fe1\u606f\uff1a<\/p>\n<pre><code>CREATE TABLE employees (\n    id INT PRIMARY KEY,\n    name VARCHAR(100),\n    salary DECIMAL(10, 2)\n);<\/code><\/pre>\n<p>\u5982\u679c\u6211\u5011\u60f3\u8981\u5c07\u54e1\u5de5 ID \u70ba 1 \u7684\u85aa\u6c34\u66f4\u65b0\u70ba 60000\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u7684 UPDATE \u8a9e\u53e5\uff1a<\/p>\n<pre><code>UPDATE employees\nSET salary = 60000\nWHERE id = 1;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u6703\u628a ID \u70ba 1 \u7684\u54e1\u5de5\u7684\u85aa\u6c34\u66f4\u65b0\u70ba 60000\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-RPDDMVrhPU\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u4f7f\u7528 WHERE \u5b50\u53e5\uff1a<\/strong>\u5982\u524d\u6240\u8ff0\uff0c\u6c92\u6709 WHERE \u5b50\u53e5\u7684 UPDATE \u8a9e\u53e5\u6703\u5f71\u97ff\u6574\u500b\u8868\u7684\u6240\u6709\u884c\uff0c\u56e0\u6b64\u5728\u57f7\u884c\u66f4\u65b0\u64cd\u4f5c\u6642\u5fc5\u9808\u5c0f\u5fc3\u3002<\/li>\n<li><strong>\u6578\u64da\u985e\u578b\u5339\u914d\uff1a<\/strong>\u5728\u66f4\u65b0\u6578\u64da\u6642\uff0c\u78ba\u4fdd\u65b0\u503c\u7684\u6578\u64da\u985e\u578b\u8207\u5217\u7684\u6578\u64da\u985e\u578b\u76f8\u7b26\uff0c\u4ee5\u907f\u514d\u51fa\u73fe\u932f\u8aa4\u3002<\/li>\n<li><strong>\u4e8b\u52d9\u8655\u7406\uff1a<\/strong>\u5728\u9032\u884c\u591a\u689d UPDATE \u64cd\u4f5c\u6642\uff0c\u5efa\u8b70\u4f7f\u7528\u4e8b\u52d9\u4f86\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u53ef\u4ee5\u4f7f\u7528 <code>BEGIN<\/code> \u548c <code>COMMIT<\/code> \u4f86\u63a7\u5236\u4e8b\u52d9\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%80%b2%e9%9a%8e%e7%94%a8%e6%b3%95-RPDDMVrhPU\">\u9032\u968e\u7528\u6cd5<\/h2>\n<p>\u9664\u4e86\u57fa\u672c\u7684 UPDATE \u8a9e\u53e5\uff0cDB2 \u9084\u652f\u6301\u4e00\u4e9b\u9032\u968e\u7684\u7528\u6cd5\u3002\u4f8b\u5982\uff0c\u6211\u5011\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 department_id = 2;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u6703\u628a\u6240\u6709\u90e8\u9580 ID \u70ba 2 \u7684\u54e1\u5de5\u7684\u85aa\u6c34\u66f4\u65b0\u70ba\u6240\u6709\u54e1\u5de5\u85aa\u6c34\u7684\u5e73\u5747\u503c\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-RPDDMVrhPU\">\u7e3d\u7d50<\/h2>\n<p>\u5728 DB2 \u4e2d\uff0cUPDATE \u8a9e\u53e5\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u7528\u65bc\u4fee\u6539\u6578\u64da\u8868\u4e2d\u7684\u6578\u64da\u3002\u901a\u904e\u6b63\u78ba\u4f7f\u7528 UPDATE \u8a9e\u53e5\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u9748\u6d3b\u5730\u7ba1\u7406\u6578\u64da\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u4e00\u81f4\u6027\u3002\u7121\u8ad6\u662f\u5728\u5c0f\u578b\u61c9\u7528\u9084\u662f\u5927\u578b\u7cfb\u7d71\u4e2d\uff0c\u638c\u63e1 UPDATE \u8a9e\u53e5\u7684\u4f7f\u7528\u90fd\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u7528\u6236\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u61c9\u7528\u90e8\u7f72\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728 DB2 \u7b49\u6578\u64da\u5eab\u4e2d\u4f7f\u7528 UPDATE \u8a9e\u53e5\u9032\u884c\u6578\u64da\u66f4\u65b0\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\u548c\u6e96\u78ba\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-144149","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144149","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=144149"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144149\/revisions"}],"predecessor-version":[{"id":144150,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144149\/revisions\/144150"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=144149"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=144149"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=144149"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}