{"id":200992,"date":"2025-05-06T12:12:21","date_gmt":"2025-05-06T04:12:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200992\/"},"modified":"2025-05-06T12:12:21","modified_gmt":"2025-05-06T04:12:21","slug":"%e6%88%91%e4%ba%86%e8%a7%a3-sql-%e6%9f%a5%e8%af%a2%e7%9a%84%e6%89%a7%e8%a1%8c%e9%a1%ba%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200992\/","title":{"rendered":"\u6211\u4e86\u89e3 SQL \u67e5\u8be2\u7684\u6267\u884c\u987a\u5e8f"},"content":{"rendered":"

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

\u6211\u4e86\u89e3 SQL \u67e5\u8be2\u7684\u6267\u884c\u987a\u5e8f<\/h1>\n

\u4f60\u5728\u5b66\u4e60\u76f8\u5173\u7684\u77e5\u8bc6\u5417\uff1f\u672c\u6587\uff0c\u4e3b\u8981\u4ecb\u7ecd\u7684\u5185\u5bb9\u5c31\u6d89\u53ca\u5230\uff0c\u5982\u679c\u4f60\u60f3\u63d0\u5347\u81ea\u5df1\u7684\u5f00\u53d1\u80fd\u529b\uff0c\u5c31\u4e0d\u8981\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0\uff0c\u5927\u5bb6\u8981\u77e5\u9053\u7f16\u7a0b\u7406\u8bba\u57fa\u7840\u548c\u5b9e\u6218\u64cd\u4f5c\u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u54e6\uff01<\/p>\n

<\/p>\n

\u4e00\u822c\u6765\u8bf4\uff0c\u5728\u5de5\u4f5c\u73af\u5883\u4e2d\uff0c\u6211\u503e\u5411\u4e8e\u5411\u521d\u7ea7\u5f00\u53d1\u4eba\u5458\u63d0\u4f9b\u63d0\u793a\u548c\u89e3\u91ca\u4e00\u4e9b\u6982\u5ff5\uff0c\u4ee5\u4fbf\u4ed6\u4eec\u80fd\u591f\u9010\u6e10\u5438\u6536\u6709\u5173\u6027\u80fd\u3001\u826f\u597d\u5b9e\u8df5\u548c\u5b89\u5168\u65b9\u9762\u7684\u6982\u5ff5\u3002\u6211\u60f3\u5f3a\u8c03\u7684\u4e00\u70b9\u662f SQL \u67e5\u8be2\u6267\u884c\u987a\u5e8f\u7684\u91cd\u8981\u6027\u3002\u5f53\u6211\u610f\u8bc6\u5230\u4ed6\u4eec\u5df2\u7ecf\u514b\u670d\u4e86\u6700\u521d\u7684 SQL \u56f0\u96be\u5e76\u5f00\u59cb\u5c1d\u8bd5\u521b\u5efa\u66f4\u5f3a\u5927\u548c\u66f4\u590d\u6742\u7684\u67e5\u8be2\u65f6\uff0c\u6211\u901a\u5e38\u4f1a\u63a5\u8fd1\u8fd9\u4e2a\u4e3b\u9898\u3002<\/p>\n

\u6267\u884c\u6307\u4ee4 <\/h2>\n
    \n
  1. FROM<\/strong>\uff1a\u5b9a\u4e49\u6570\u636e\u67e5\u8be2\u7684\u4e3b\u8868\u3002<\/li>\n
  2. JOIN<\/strong>\uff1a\u5efa\u7acb\u8868\u4e4b\u95f4\u7684\u8054\u63a5\u548c\u5173\u7cfb\u3002<\/li>\n
  3. ON<\/strong>\uff1a\u5b9a\u4e49\u8fde\u63a5\u8868\u7684\u6761\u4ef6\uff0c\u7a81\u51fa\u663e\u793a\u5b83\u4eec\u4e4b\u95f4\u7684\u5173\u7cfb\u952e\u3002<\/li>\n
  4. WHERE<\/strong>\uff1a\u8fc7\u6ee4\u67e5\u8be2\u5230\u7684\u6570\u636e\u3002<\/li>\n
  5. GROUP BY<\/strong>\uff1a\u5bf9\u5171\u4eab\u7279\u5b9a\u503c\u7684\u6570\u636e\u8fdb\u884c\u5206\u7ec4\u3002<\/li>\n
  6. HAVING<\/strong>\uff1a\u8fc7\u6ee4GROUP BY\u5206\u7ec4\u540e\u7684\u6570\u636e\u3002<\/li>\n
  7. SELECT<\/strong>\uff1a\u9009\u62e9\u8868\u7684\u5217\u3002<\/li>\n
  8. DISTINCT<\/strong>\uff1a\u5220\u9664\u5177\u6709\u91cd\u590d\u6570\u636e\u7684\u884c\u3002<\/li>\n
  9. ORDER BY<\/strong>\uff1a\u5bf9\u67e5\u8be2\u7684\u6570\u636e\u96c6\u8fdb\u884c\u6392\u5e8f\u3002<\/li>\n
  10. LIMIT<\/strong>\uff1a\u9650\u5236\u6700\u7ec8\u7ed3\u679c\u8fd4\u56de\u7684\u884c\u6570\u3002<\/li>\n<\/ol>\n

    \u5f3a\u8c03\u6267\u884c\u987a\u5e8f\u7684\u91cd\u8981\u6027\u6709\u51e0\u4e2a\u539f\u56e0\uff0c\u6211\u5728\u4e0b\u9762\u91cd\u70b9\u4ecb\u7ecd\u5176\u4e2d\u4e00\u4e9b\uff1a<\/p>\n

      \n
    1. \n

      \u67e5\u8be2\u4f18\u5316<\/strong>\uff1a\u4e00\u4e2a\u6709\u8da3\u7684\u4f8b\u5b50\u662f\u8fc7\u6ee4\u5668\u7684\u4f7f\u7528\u3002\u77e5\u9053 JOIN \u548c ON \u5b50\u53e5\u662f\u5728 WHERE \u4e4b\u524d\u5904\u7406\u7684\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528\u5b83\u4eec\u6765\u9650\u5236\u5df2\u5904\u4e8e\u8fde\u63a5\u9636\u6bb5\u7684\u6570\u636e\uff0c\u4ece\u800c\u51cf\u5c11 WHERE \u5b50\u53e5\u4e2d\u5bf9\u5176\u4ed6\u8fc7\u6ee4\u5668\u7684\u9700\u6c42\u3002<\/p>\n<\/li>\n

    2. \n

      \u7ed3\u679c\u53ef\u9884\u6d4b\u6027<\/strong>\uff1a\u4e86\u89e3\u6267\u884c\u987a\u5e8f\u53ef\u4ee5\u8ba9\u60a8\u51c6\u786e\u9884\u6d4b\u67e5\u8be2\u7ed3\u679c\uff0c\u8fd9\u6709\u52a9\u4e8e\u786e\u4fdd\u68c0\u7d22\u5230\u7684\u6570\u636e\u6b63\u662f\u60a8\u60f3\u8981\u7684\uff0c\u4e0d\u4f1a\u51fa\u73b0\u610f\u5916\u6216\u4e0d\u4e00\u81f4\u7684\u60c5\u51b5\u3002<\/p>\n<\/li>\n

    3. \n

      \u6784\u5efa\u590d\u6742\u67e5\u8be2<\/strong>\uff1a\u5728\u66f4\u590d\u6742\u7684\u67e5\u8be2\u4e2d\uff0c\u4e86\u89e3\u6267\u884c\u987a\u5e8f\u6709\u52a9\u4e8e\u7ec4\u7ec7\u67e5\u8be2\u7ed3\u6784\uff0c\u786e\u4fdd\u6bcf\u4e2a\u6b65\u9aa4\u5728\u9002\u5f53\u7684\u65f6\u95f4\u5904\u7406\u3002<\/p>\n<\/li>\n<\/ol>\n

      \u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6570\u636e\u5e93\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n

      \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1adev.to \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb \u5220\u9664 <\/p>\n

      \n
      \n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"

      \u6211\u4e86\u89e3 SQL \u67e5\u8be2\u7684\u6267\u884c\u987a\u5e8f ...<\/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-200992","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200992","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=200992"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200992\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200992"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200992"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200992"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}