{"id":3682,"date":"2022-07-04T15:05:50","date_gmt":"2022-07-04T07:05:50","guid":{"rendered":"http:\/\/www.eddic.net\/mall\/?p=3682"},"modified":"2024-01-02T18:41:13","modified_gmt":"2024-01-02T10:41:13","slug":"%e5%a6%82%e4%bd%95%e7%94%a8sql%e7%8e%a9%e8%bd%ac%e6%95%b0%e6%8d%ae%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"http:\/\/www.eddic.net\/mall\/%e5%a6%82%e4%bd%95%e7%94%a8sql%e7%8e%a9%e8%bd%ac%e6%95%b0%e6%8d%ae%e5%88%86%e6%9e%90\/","title":{"rendered":"\u5982\u4f55\u7528SQL\u73a9\u8f6c\u6570\u636e\u5206\u6790"},"content":{"rendered":"
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\u5982\u4f55\u7528SQL\u73a9\u8f6c\u6570\u636e\u5206\u6790<\/h1>\n
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\u8bfe\u7a0b\u65f6\u957f<\/strong>\uff1a1\u5929<\/p>\n

\u8bfe\u7a0b\u7279\u8272<\/strong><\/p>\n

SQL\u662f\u4e00\u79cd\u4e13\u95e8\u7528\u6765\u4e0e\u6570\u636e\u5e93\u6c9f\u901a\u7684\u8bed\u8a00\uff0c\u662f\u6240\u6709\u6570\u636e\u65b9\u5411\u7684\u5fc5\u5907\u6280\u80fd\uff0c\u4e5f\u662f\u6bd4\u8f83\u5bb9\u6613\u5b66\u7684\u6280\u80fd\u3002<\/p>\n

\u4f46\u76ee\u524d\u5e02\u9762\u4e0a\u7684\u5b66\u4e60\u8d44\u6599\u592a\u7e41\u6742\uff0c\u6293\u4e0d\u4f4f\u91cd\u70b9\u3002\u800c\u4e14\u5b66\u4e60\u5185\u5bb9\u4e0e\u5b9e\u9645\u7684\u5de5\u4f5c\u573a\u666f\u5dee\u8ddd\u592a\u5927\uff0c\u5b66\u5b8c\u65e0\u6cd5\u5b9e\u8df5\uff0c\u518d\u52a0\u4e0a\u6ca1\u6709\u771f\u5b9e\u6570\u636e\u5e93\u73af\u5883\u7ec3\u4e60\uff0c\u5f88\u5bb9\u6613\u5b66\u5b8c\u5c31\u5fd8\u3002<\/p>\n

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\u89e3\u51b3\u75db\u70b9<\/strong><\/p>\n

    \n
  1. \u4e86\u89e3\u6570\u636e\u5e93\u548c\u6570\u636e\u8868\u7684\u6982\u5ff5\uff0c\u5b8c\u6210MySQL\u7684\u5b89\u88c5\u7b49\u57fa\u7840\u5185\u5bb9\u3002<\/li>\n
  2. \u638c\u63e1\u5de5\u4f5c\u4e2dSQL\u6700\u5e38\u7528\u76848\u4e2a\u6838\u5fc3\u8bed\u53e5\u3002<\/li>\n
  3. \u638c\u63e1SQL\u5e38\u7528\u76844\u4e2a\u8fdb\u9636\u7528\u6cd5\u3002<\/li>\n
  4. \u638c\u63e1\u590d\u6742\u95ee\u9898\u9010\u6b65\u62c6\u89e3\u7684\u601d\u7ef4\u548c\u80fd\u529b\u3002<\/li>\n<\/ol>\n

    \u8bfe\u7a0b\u5bf9\u8c61<\/strong><\/p>\n

      \n
    1. \u6709\u5fd7\u4e8e\u6210\u4e3a\u6570\u636e\u5206\u6790\u5e08\u7684\u5c0f\u767d<\/li>\n
    2. \u60f3\u8981\u5b66\u4e60SQL\uff0c\u63d0\u5347\u81ea\u5df1\u6570\u636e\u5206\u6790\u6548\u7387\u7684\u8fd0\u8425\u4eba<\/li>\n<\/ol>\n

      \u8bfe\u7a0b\u7eb2\u8981<\/strong><\/p>\n

      \u4e0a\u5348<\/strong><\/p>\n

      SQL<\/strong>\u57fa\u7840\u77e5\u8bc6\u8bb2\u89e3<\/strong><\/p>\n

        \n
      1. \u4e86\u89e3SQL<\/li>\n
      2. \u6570\u636e\u5e93\u57fa\u7840\u53caSQL\u8bed\u8a00<\/li>\n
      3. \u6570\u636e\u5206\u6790\u5e08\u7684\u5de5\u4f5c\u573a\u666f<\/li>\n
      4. SQL\u5b89\u88c5\u8d44\u6599<\/li>\n<\/ol>\n

        SQL<\/strong>\u6838\u5fc3\u8bed\u53e5\u638c\u63e1<\/strong><\/p>\n

          \n
        1. sql\u6838\u5fc3\u8bed\u53e5\u53ca\u6848\u4f8b\u7b80\u4ecb<\/li>\n
        2. \u521b\u5efa\u8868\u3001\u63d2\u5165\u8868\uff08creat \/insert)<\/li>\n
        3. \u57fa\u7840\u67e5\u8be2\u4e0e\u7b5b\u9009\uff08select\/where\uff09<\/li>\n
        4. \u805a\u5408\u51fd\u6570(count)<\/li>\n
        5. group by\u3001having\u53ca\u5176\u4e0ewhere\u7684\u533a\u522b<\/li>\n
        6. distinct\u3001order by\u3001limit<\/li>\n
        7. \u6838\u5fc3\u8bed\u53e5\u603b\u7ed3<\/li>\n<\/ol>\n

          \u6848\u4f8b<\/strong><\/p>\n