{"id":199658,"date":"2025-05-06T08:14:21","date_gmt":"2025-05-06T00:14:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/199658\/"},"modified":"2025-05-06T08:14:21","modified_gmt":"2025-05-06T00:14:21","slug":"%e4%b8%89%e7%a7%8dsql-update%e8%af%ad%e5%8f%a5%e7%9a%84%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199658\/","title":{"rendered":"\u4e09\u79cdSQL Update\u8bed\u53e5\u7684\u793a\u4f8b"},"content":{"rendered":"

<\/b> <\/p>\n

\u4e09\u79cdSQL Update\u8bed\u53e5\u7684\u793a\u4f8b<\/h1>\n

\u5927\u5bb6\u597d\uff0c\u4eca\u5929\u672c\u4eba\u7ed9\u5927\u5bb6\u5e26\u6765\u6587\u7ae0\uff0c\u6587\u4e2d\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230\uff0c\u5982\u679c\u4f60\u5bf9\u65b9\u9762\u7684\u77e5\u8bc6\u70b9\u611f\u5174\u8da3\uff0c\u90a3\u5c31\u8bf7\u5404\u4f4d\u670b\u53cb\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427~\u5e0c\u671b\u80fd\u771f\u6b63\u5e2e\u5230\u4f60\u4eec\uff0c\u8c22\u8c22\uff01<\/p>\n

SQL Update\u4e09\u79cd\u7528\u6cd5\uff0c\u9700\u8981\u5177\u4f53\u4ee3\u7801\u793a\u4f8b<\/p>\n

SQL\uff08Structured Query Language\uff09\u662f\u4e00\u79cd\u7528\u4e8e\u7ba1\u7406\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u7f16\u7a0b\u8bed\u8a00\u3002\u5728SQL\u4e2d\uff0cUpdate\u8bed\u53e5\u7528\u4e8e\u4fee\u6539\u5df2\u6709\u7684\u6570\u636e\u3002\u5b83\u7684\u57fa\u672c\u8bed\u6cd5\u662fUPDATE \u8868\u540d SET \u5217\u540d = \u65b0\u503c WHERE \u6761\u4ef6<\/code>\u3002\u5728\u672c\u6587\u4e2d\uff0c\u5c06\u4ecb\u7ecdSQL Update\u8bed\u53e5\u7684\u4e09\u79cd\u5e38\u89c1\u7528\u6cd5\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n

\u4e00\u3001\u66f4\u65b0\u5355\u4e2a\u8bb0\u5f55
\u7b2c\u4e00\u79cd\u7528\u6cd5\u662f\u66f4\u65b0\u5355\u4e2a\u8bb0\u5f55\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528Update\u8bed\u53e5\u53ef\u4ee5\u76f4\u63a5\u6307\u5b9a\u8981\u66f4\u65b0\u7684\u76ee\u6807\u8868\u3001\u76ee\u6807\u5217\u548c\u65b0\u503c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5177\u4f53\u7684\u793a\u4f8b\uff1a<\/p>\n

UPDATE students\nSET grade = 'A'\nWHERE student_id = 1001;<\/pre>\n
\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5047\u8bbe\u6709\u4e00\u4e2a\u540d\u4e3astudents<\/code>\u7684\u8868\uff0c\u5305\u542b\u5217student_id<\/code>\u548cgrade<\/code>\u3002\u6211\u4eec\u5e0c\u671b\u5c06student_id<\/code>\u4e3a1001\u7684\u5b66\u751f\u7684grade<\/code>\u66f4\u65b0\u4e3a’A’\u3002\u4f7f\u7528Update\u8bed\u53e5\uff0c\u6211\u4eec\u53ef\u4ee5\u6307\u5b9a\u76ee\u6807\u8868\u4e3astudents<\/code>\uff0c\u8981\u66f4\u65b0\u7684\u5217\u4e3agrade<\/code>\uff0c\u65b0\u503c\u4e3a’A’\uff0c\u5e76\u6dfb\u52a0WHERE\u5b50\u53e5\u4ee5\u9650\u5b9a\u6761\u4ef6\u4e3astudent_id = 1001<\/code>\u3002<\/p>\n
\u4e8c\u3001\u6279\u91cf\u66f4\u65b0\u8bb0\u5f55
\u7b2c\u4e8c\u79cd\u7528\u6cd5\u662f\u6279\u91cf\u66f4\u65b0\u8bb0\u5f55\u3002\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u4e00\u6b21\u6027\u66f4\u65b0\u591a\u6761\u8bb0\u5f55\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5177\u4f53\u7684\u793a\u4f8b\uff1a<\/p>\n
UPDATE students\nSET grade = 'A'\nWHERE grade = 'B';<\/pre>\n
\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c06\u76ee\u6807\u8868\u3001\u76ee\u6807\u5217\u548c\u65b0\u503c\u8bbe\u7f6e\u4e3astudents<\/code>\u3001grade<\/code>\u548c’A’\uff0c\u5e76\u4f7f\u7528WHERE\u5b50\u53e5\u6307\u5b9a\u8981\u66f4\u65b0\u7684\u6761\u4ef6\u4e3agrade = 'B'<\/code>\u3002\u8fd9\u610f\u5473\u7740\u6211\u4eec\u5c06\u5c06\u6240\u6709grade<\/code>\u4e3a’B’\u7684\u8bb0\u5f55\u66f4\u65b0\u4e3a’A’\u3002<\/p>\n
\u4e09\u3001\u4f7f\u7528\u5b50\u67e5\u8be2\u66f4\u65b0\u8bb0\u5f55
\u7b2c\u4e09\u79cd\u7528\u6cd5\u662f\u4f7f\u7528\u5b50\u67e5\u8be2\u66f4\u65b0\u8bb0\u5f55\u3002\u6709\u65f6\u5019\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u6839\u636e\u53e6\u4e00\u4e2a\u8868\u6216\u67e5\u8be2\u7684\u7ed3\u679c\u6765\u66f4\u65b0\u76ee\u6807\u8868\u7684\u8bb0\u5f55\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5177\u4f53\u7684\u793a\u4f8b\uff1a<\/p>\n
UPDATE students\nSET grade = 'A'\nWHERE student_id IN (\n    SELECT student_id\n    FROM scores\n    WHERE score > 90\n);<\/pre>\n
\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c06\u76ee\u6807\u8868\u3001\u76ee\u6807\u5217\u548c\u65b0\u503c\u8bbe\u7f6e\u4e3astudents<\/code>\u3001grade<\/code>\u548c’A’\u3002\u5728WHERE\u5b50\u53e5\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86\u5b50\u67e5\u8be2\uff0c\u8be5\u5b50\u67e5\u8be2\u9009\u53d6\u4e86scores<\/code>\u8868\u4e2d\u6210\u7ee9\u5927\u4e8e90\u5206\u7684\u5b66\u751f\u7684student_id<\/code>\u3002\u8fd9\u610f\u5473\u7740\u6211\u4eec\u5c06\u66f4\u65b0\u6240\u6709\u5728\u5b50\u67e5\u8be2\u7ed3\u679c\u4e2d\u51fa\u73b0\u7684\u5b66\u751f\u7684grade<\/code>\u4e3a’A’\u3002<\/p>\n
\u901a\u8fc7\u4ee5\u4e0a\u4e09\u79cd\u7528\u6cd5\u7684\u5177\u4f53\u793a\u4f8b\uff0c\u6211\u4eec\u53ef\u4ee5\u66f4\u597d\u5730\u7406\u89e3SQL Update\u8bed\u53e5\u7684\u7528\u6cd5\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u7684\u9700\u6c42\u548c\u6761\u4ef6\u7075\u6d3b\u5730\u4f7f\u7528Update\u8bed\u53e5\u6765\u4fee\u6539\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u3002<\/p>\n
\u603b\u7ed3\uff1a<\/p>\n
    \n
  • \u66f4\u65b0\u5355\u4e2a\u8bb0\u5f55\uff1a\u4f7f\u7528Update\u8bed\u53e5\u76f4\u63a5\u6307\u5b9a\u76ee\u6807\u8868\u3001\u76ee\u6807\u5217\u548c\u65b0\u503c\uff0c\u6dfb\u52a0\u6761\u4ef6\u9650\u5b9a\u66f4\u65b0\u7684\u8bb0\u5f55\u3002<\/li>\n
  • \u6279\u91cf\u66f4\u65b0\u8bb0\u5f55\uff1a\u4f7f\u7528Update\u8bed\u53e5\u6307\u5b9a\u76ee\u6807\u8868\u3001\u76ee\u6807\u5217\u548c\u65b0\u503c\uff0c\u901a\u8fc7WHERE\u5b50\u53e5\u6307\u5b9a\u8981\u66f4\u65b0\u7684\u6761\u4ef6\uff0c\u53ef\u4ee5\u540c\u65f6\u66f4\u65b0\u591a\u6761\u8bb0\u5f55\u3002<\/li>\n
  • \u4f7f\u7528\u5b50\u67e5\u8be2\u66f4\u65b0\u8bb0\u5f55\uff1a\u4f7f\u7528Update\u8bed\u53e5\u6307\u5b9a\u76ee\u6807\u8868\u3001\u76ee\u6807\u5217\u548c\u65b0\u503c\uff0c\u5c06\u5b50\u67e5\u8be2\u7684\u7ed3\u679c\u4f5c\u4e3aWHERE\u5b50\u53e5\u7684\u6761\u4ef6\u6765\u66f4\u65b0\u76ee\u6807\u8868\u7684\u8bb0\u5f55\u3002<\/li>\n<\/ul>\n
    \u4ee5\u4e0a\u662fSQL Update\u8bed\u53e5\u7684\u4e09\u79cd\u5e38\u89c1\u7528\u6cd5\uff0c\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u80fd\u5bf9\u8bfb\u8005\u66f4\u52a0\u6e05\u6670\u5730\u89e3\u91ca\u548c\u7406\u89e3SQL Update\u8bed\u53e5\u7684\u4f7f\u7528\u3002<\/p>\n
    \u4ee5\u4e0a\u5c31\u662f\u300a\u4e09\u79cdSQL Update\u8bed\u53e5\u7684\u793a\u4f8b\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8e\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff01<\/p>\n
    \n
    \n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
    \u4e09\u79cdSQL Update\u8bed\u53e5\u7684\u793a...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-199658","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199658","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=199658"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199658\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=199658"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=199658"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=199658"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}