{"id":199676,"date":"2025-05-06T09:32:44","date_gmt":"2025-05-06T01:32:44","guid":{"rendered":"https:\/\/server.hk\/cnblog\/199676\/"},"modified":"2025-05-06T09:32:44","modified_gmt":"2025-05-06T01:32:44","slug":"%e7%a4%ba%e4%be%8bupdate-sql%e8%af%ad%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199676\/","title":{"rendered":"\u793a\u4f8bupdate SQL\u8bed\u53e5"},"content":{"rendered":"

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

\u793a\u4f8bupdate SQL\u8bed\u53e5<\/h1>\n

\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300a\u793a\u4f8bupdate SQL\u8bed\u53e5\u300b\uff0c\u8986\u76d6\u4e86\u6570\u636e\u5e93\u7684\u5e38\u89c1\u57fa\u7840\u77e5\u8bc6\uff0c\u5176\u5b9e\u4e00\u4e2a\u8bed\u8a00\u7684\u5168\u90e8\u77e5\u8bc6\u70b9\u4e00\u7bc7\u6587\u7ae0\u662f\u4e0d\u53ef\u80fd\u8bf4\u5b8c\u7684\uff0c\u4f46\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u95ee\u9898\uff0c\u8ba9\u8bfb\u8005\u5bf9\u81ea\u5df1\u7684\u638c\u63e1\u7a0b\u5ea6\u6709\u4e00\u5b9a\u7684\u8ba4\u8bc6(B \u6570)\uff0c\u4ece\u800c\u5f25\u8865\u81ea\u5df1\u7684\u4e0d\u8db3\uff0c\u66f4\u597d\u7684\u638c\u63e1\u5b83\u3002<\/p>\n

SQL\u662f\u4e00\u79cd\u7528\u4e8e\u7ba1\u7406\u548c\u5904\u7406\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u7f16\u7a0b\u8bed\u8a00\uff0c\u5b83\u5177\u6709\u5f3a\u5927\u7684\u529f\u80fd\u548c\u7075\u6d3b\u6027\u3002\u5728\u5b9e\u9645\u7684\u6570\u636e\u5e93\u64cd\u4f5c\u4e2d\uff0c\u66f4\u65b0\uff08Update\uff09\u64cd\u4f5c\u662f\u975e\u5e38\u5e38\u89c1\u548c\u91cd\u8981\u7684\uff0c\u5b83\u7528\u4e8e\u4fee\u6539\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u3002<\/p>\n

update\u8bed\u53e5\u7528\u4e8e\u66f4\u65b0\u6570\u636e\u5e93\u8868\u4e2d\u7684\u8bb0\u5f55\u3002\u4e0b\u9762\uff0c\u6211\u5c06\u4e3a\u5927\u5bb6\u4ecb\u7ecd\u4e00\u4e9b\u5e38\u89c1\u7684update\u8bed\u53e5\u5b9e\u4f8b\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\uff0c\u4ee5\u5e2e\u52a9\u8bfb\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u5e94\u7528\u3002<\/p>\n

    \n
  1. \u66f4\u65b0\u5355\u4e2a\u5b57\u6bb5\u7684\u503c\uff1a<\/li>\n<\/ol>\n

    \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3a”students”\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e86\u5b66\u751f\u7684ID\u3001\u59d3\u540d\u548c\u5e74\u9f84\u3002<\/p>\n

    \u8981\u66f4\u65b0\u5b66\u751f\u59d3\u540d\u4e3a”\u5f20\u4e09”\uff0c\u5e74\u9f84\u4e3a18\u5c81\u7684\u8bb0\u5f55\uff0c\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u7684update\u8bed\u53e5\uff1a<\/p>\n

    UPDATE students SET name = '\u5f20\u4e09', age = 18 WHERE id = 1;<\/pre>\n
    \u8fd9\u6761\u8bed\u53e5\u4e2d\uff0cstudents\u662f\u8868\u540d\uff0cname\u548cage\u662f\u5b57\u6bb5\u540d\uff0c’\u5f20\u4e09’\u548c18\u662f\u8981\u66f4\u65b0\u7684\u503c\uff0cid = 1\u662f\u7528\u4e8e\u6307\u5b9a\u6761\u4ef6\u7684\u5b50\u53e5\u3002<\/p>\n
      \n
    1. \u66f4\u65b0\u591a\u4e2a\u5b57\u6bb5\u7684\u503c\uff1a<\/li>\n<\/ol>\n
      \u5982\u679c\u8981\u540c\u65f6\u66f4\u65b0\u591a\u4e2a\u5b57\u6bb5\u7684\u503c\uff0c\u53ef\u4ee5\u5728update\u8bed\u53e5\u4e2d\u4f7f\u7528\u9017\u53f7\u5206\u9694\u6bcf\u4e2a\u5b57\u6bb5\u7684\u66f4\u65b0\u64cd\u4f5c\u3002<\/p>\n
      \u4f8b\u5982\uff0c\u6211\u4eec\u8981\u66f4\u65b0\u5b66\u751fID\u4e3a1\u7684\u59d3\u540d\u4e3a”\u674e\u56db”\uff0c\u5e74\u9f84\u4e3a20\u5c81\uff0c\u6027\u522b\u4e3a”\u7537”\u7684\u8bb0\u5f55\uff0c\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u7684update\u8bed\u53e5\uff1a<\/p>\n
      UPDATE students SET name = '\u674e\u56db', age = 20, gender = '\u7537' WHERE id = 1;<\/pre>\n
        \n
      1. \u66f4\u65b0\u90e8\u5206\u8bb0\u5f55\u7684\u503c\uff1a<\/li>\n<\/ol>\n
        \u6709\u65f6\u5019\uff0c\u6211\u4eec\u53ea\u9700\u8981\u66f4\u65b0\u8868\u4e2d\u6ee1\u8db3\u67d0\u4e9b\u6761\u4ef6\u7684\u8bb0\u5f55\u7684\u503c\u3002\u5728update\u8bed\u53e5\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528WHERE\u5b50\u53e5\u6307\u5b9a\u6761\u4ef6\u3002<\/p>\n
        \u4f8b\u5982\uff0c\u6211\u4eec\u8981\u66f4\u65b0\u6240\u6709\u540d\u5b57\u4e3a”\u5f20\u4e09”\u7684\u5b66\u751f\u7684\u5e74\u9f84\u4e3a20\u5c81\uff0c\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u7684update\u8bed\u53e5\uff1a<\/p>\n
        UPDATE students SET age = 20 WHERE name = '\u5f20\u4e09';<\/pre>\n
        \u8fd9\u6761\u8bed\u53e5\u4e2d\uff0cname = ‘\u5f20\u4e09’\u662f\u7b5b\u9009\u6761\u4ef6\uff0c\u8868\u793a\u53ea\u66f4\u65b0\u6ee1\u8db3\u8be5\u6761\u4ef6\u7684\u8bb0\u5f55\u3002<\/p>\n
          \n
        1. \u4f7f\u7528\u5b50\u67e5\u8be2\u66f4\u65b0\u8bb0\u5f55\u7684\u503c\uff1a<\/li>\n<\/ol>\n
          \u5728update\u8bed\u53e5\u4e2d\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5b50\u67e5\u8be2\uff08subquery\uff09\u6765\u66f4\u65b0\u8bb0\u5f55\u7684\u503c\u3002<\/p>\n
          \u4f8b\u5982\uff0c\u6211\u4eec\u8981\u5c06\u5b66\u751f\u8868\u4e2d\u5e74\u9f84\u9ad8\u4e8e\u5e73\u5747\u5e74\u9f84\u7684\u5b66\u751f\u7684\u59d3\u540d\u90fd\u6539\u4e3a”\u4f18\u79c0\u5b66\u751f”\uff0c\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u7684update\u8bed\u53e5\uff1a<\/p>\n
          UPDATE students SET name = '\u4f18\u79c0\u5b66\u751f' WHERE age > (SELECT AVG(age) FROM students);<\/pre>\n
          \u8fd9\u6761\u8bed\u53e5\u4e2d\uff0c(SELECT AVG(age) FROM students)\u662f\u4e00\u4e2a\u5b50\u67e5\u8be2\uff0c\u7528\u4e8e\u83b7\u53d6\u5b66\u751f\u8868\u4e2d\u5e74\u9f84\u7684\u5e73\u5747\u503c\u3002<\/p>\n
          \u603b\u7ed3\uff1a<\/p>\n
          \u4ee5\u4e0a\u662f\u51e0\u4e2a\u5e38\u89c1\u7684update\u8bed\u53e5\u5b9e\u4f8b\uff0c\u5305\u62ec\u66f4\u65b0\u5355\u4e2a\u5b57\u6bb5\u3001\u66f4\u65b0\u591a\u4e2a\u5b57\u6bb5\u3001\u66f4\u65b0\u90e8\u5206\u8bb0\u5f55\u548c\u4f7f\u7528\u5b50\u67e5\u8be2\u66f4\u65b0\u8bb0\u5f55\u7684\u503c\u3002\u5728\u5b9e\u9645\u7684\u6570\u636e\u5e93\u64cd\u4f5c\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u7684\u9700\u6c42\u548c\u4e1a\u52a1\u903b\u8f91\uff0c\u7ed3\u5408\u4ee5\u4e0a\u7684\u793a\u4f8b\uff0c\u7075\u6d3b\u8fd0\u7528update\u8bed\u53e5\u6765\u4fee\u6539\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u3002<\/p>\n
          \u5199\u5230\u8fd9\u91cc\uff0c\u6211\u5e0c\u671b\u901a\u8fc7\u8fd9\u7bc7\u6587\u7ae0\u80fd\u591f\u5e2e\u52a9\u8bfb\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u5e94\u7528update\u8bed\u53e5\uff0c\u4ece\u800c\u6709\u6548\u5730\u8fdb\u884c\u6570\u636e\u5e93\u64cd\u4f5c\u3002\u611f\u8c22\u60a8\u7684\u9605\u8bfb\uff01<\/p>\n
          \u4eca\u5929\u5173\u4e8e\u300a\u793a\u4f8bupdate SQL\u8bed\u53e5\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n
          \n
          \n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
          \u793a\u4f8bupdate SQL\u8bed\u53e5 \u672c...<\/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-199676","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199676","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=199676"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199676\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=199676"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=199676"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=199676"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}