{"id":199685,"date":"2025-05-06T10:52:58","date_gmt":"2025-05-06T02:52:58","guid":{"rendered":"https:\/\/server.hk\/cnblog\/199685\/"},"modified":"2025-05-06T10:52:58","modified_gmt":"2025-05-06T02:52:58","slug":"%e5%ae%8c%e6%95%b4%e7%9a%84sql%e6%9f%a5%e8%af%a2%e8%af%ad%e5%8f%a5%e5%88%97%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199685\/","title":{"rendered":"\u5b8c\u6574\u7684SQL\u67e5\u8be2\u8bed\u53e5\u5217\u8868"},"content":{"rendered":"

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

\u5b8c\u6574\u7684SQL\u67e5\u8be2\u8bed\u53e5\u5217\u8868<\/h1>\n

\u672c\u7bc7\u6587\u7ae0\u4e3b\u8981\u662f\u7ed3\u5408\u6211\u4e4b\u524d\u9762\u8bd5\u7684\u5404\u79cd\u7ecf\u5386\u548c\u5b9e\u6218\u5f00\u53d1\u4e2d\u9047\u5230\u7684\u95ee\u9898\u89e3\u51b3\u7ecf\u9a8c\u6574\u7406\u7684\uff0c\u5e0c\u671b\u8fd9\u7bc7\u300a\u5b8c\u6574\u7684SQL\u67e5\u8be2\u8bed\u53e5\u5217\u8868\u300b\u5bf9\u4f60\u6709\u5f88\u5927\u5e2e\u52a9\uff01\u6b22\u8fce\u6536\u85cf\uff0c\u5206\u4eab\u7ed9\u66f4\u591a\u7684\u9700\u8981\u7684\u670b\u53cb\u5b66\u4e60~<\/p>\n

SQL\u67e5\u8be2\u8bed\u53e5\u547d\u4ee4\u5927\u5168\uff0c\u9700\u8981\u5177\u4f53\u4ee3\u7801\u793a\u4f8b<\/p>\n

SQL\uff08Structured Query Language\uff09\u662f\u7528\u4e8e\u7ba1\u7406\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u6807\u51c6\u7f16\u7a0b\u8bed\u8a00\u3002\u5b83\u53ef\u4ee5\u4f7f\u7528\u5404\u79cd\u67e5\u8be2\u8bed\u53e5\u6765\u63d0\u53d6\u6240\u9700\u7684\u6570\u636e\uff0c\u4ece\u800c\u5b9e\u73b0\u5bf9\u6570\u636e\u5e93\u7684\u64cd\u4f5c\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u4e3a\u60a8\u63d0\u4f9b\u4e00\u4e9b\u5e38\u7528\u7684SQL\u67e5\u8be2\u8bed\u53e5\u547d\u4ee4\uff0c\u5e76\u9644\u4e0a\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002\u8ba9\u6211\u4eec\u6765\u4e86\u89e3\u4e00\u4e0b\u5427\u3002<\/p>\n

    \n
  1. \n

    SELECT\u8bed\u53e5\uff1a\u7528\u4e8e\u4ece\u6570\u636e\u5e93\u8868\u4e2d\u9009\u62e9\u6570\u636e\u3002<\/p>\n

      \n
    • \u67e5\u8be2\u6240\u6709\u6570\u636e\uff1aSELECT * FROM table_name;<\/li>\n
    • \u67e5\u8be2\u6307\u5b9a\u5217\u7684\u6570\u636e\uff1aSELECT column1, column2 FROM table_name;<\/li>\n
    • \u5e26\u6761\u4ef6\u7684\u67e5\u8be2\uff1aSELECT * FROM table_name WHERE condition;<\/li>\n<\/ul>\n<\/li>\n
    • \n

      INSERT\u8bed\u53e5\uff1a\u7528\u4e8e\u5411\u6570\u636e\u5e93\u8868\u4e2d\u63d2\u5165\u65b0\u7684\u6570\u636e\u3002<\/p>\n

        \n
      • \u63d2\u5165\u5355\u6761\u6570\u636e\uff1aINSERT INTO table_name (column1, column2) VALUES (value1, value2);<\/li>\n
      • \u63d2\u5165\u591a\u6761\u6570\u636e\uff1aINSERT INTO table_name (column1, column2) VALUES (value1, value2), (value3, value4);<\/li>\n<\/ul>\n<\/li>\n
      • \n

        UPDATE\u8bed\u53e5\uff1a\u7528\u4e8e\u66f4\u65b0\u6570\u636e\u5e93\u8868\u4e2d\u7684\u6570\u636e\u3002<\/p>\n

          \n
        • \u66f4\u65b0\u5355\u4e2a\u5217\u7684\u6570\u636e\uff1aUPDATE table_name SET column1 = value1 WHERE condition;<\/li>\n
        • \u66f4\u65b0\u591a\u4e2a\u5217\u7684\u6570\u636e\uff1aUPDATE table_name SET column1 = value1, column2 = value2 WHERE condition;<\/li>\n<\/ul>\n<\/li>\n
        • \n

          DELETE\u8bed\u53e5\uff1a\u7528\u4e8e\u4ece\u6570\u636e\u5e93\u8868\u4e2d\u5220\u9664\u6570\u636e\u3002<\/p>\n

            \n
          • \u5220\u9664\u6240\u6709\u6570\u636e\uff1aDELETE FROM table_name;<\/li>\n
          • \u5220\u9664\u5e26\u6761\u4ef6\u7684\u6570\u636e\uff1aDELETE FROM table_name WHERE condition;<\/li>\n<\/ul>\n<\/li>\n
          • \n

            SELECT DISTINCT\u8bed\u53e5\uff1a\u7528\u4e8e\u68c0\u7d22\u552f\u4e00\u4e0d\u91cd\u590d\u7684\u503c\u3002<\/p>\n

              \n
            • \u67e5\u8be2\u552f\u4e00\u4e0d\u91cd\u590d\u7684\u5217\uff1aSELECT DISTINCT column_name FROM table_name;<\/li>\n<\/ul>\n<\/li>\n
            • \n

              ORDER BY\u8bed\u53e5\uff1a\u7528\u4e8e\u6309\u7167\u6307\u5b9a\u5217\u5bf9\u7ed3\u679c\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n

                \n
              • \u6309\u5347\u5e8f\u6392\u5e8f\uff1aSELECT column1, column2 FROM table_name ORDER BY column1 ASC;<\/li>\n
              • \u6309\u964d\u5e8f\u6392\u5e8f\uff1aSELECT column1, column2 FROM table_name ORDER BY column1 DESC;<\/li>\n<\/ul>\n<\/li>\n
              • \n

                GROUP BY\u8bed\u53e5\uff1a\u7528\u4e8e\u5c06\u76f8\u540c\u503c\u7684\u884c\u8fdb\u884c\u5206\u7ec4\uff0c\u5e76\u5bf9\u5176\u8fdb\u884c\u805a\u5408\u8ba1\u7b97\u3002<\/p>\n

                  \n
                • \u5206\u7ec4\u5e76\u8ba1\u7b97\u603b\u6570\uff1aSELECT column1, COUNT(column2) FROM table_name GROUP BY column1;<\/li>\n<\/ul>\n<\/li>\n
                • \n

                  HAVING\u8bed\u53e5\uff1a\u7528\u4e8e\u5728GROUP BY\u8bed\u53e5\u7684\u57fa\u7840\u4e0a\uff0c\u6dfb\u52a0\u8fdb\u4e00\u6b65\u7684\u6761\u4ef6\u8fc7\u6ee4\u3002<\/p>\n

                    \n
                  • \u4f7f\u7528HAVING\u8fc7\u6ee4\u5206\u7ec4\u540e\u7684\u6570\u636e\uff1aSELECT column1, COUNT(column2) FROM table_name GROUP BY column1 HAVING COUNT(column2) > value;<\/li>\n<\/ul>\n<\/li>\n
                  • \n

                    JOIN\u8bed\u53e5\uff1a\u7528\u4e8e\u6839\u636e\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u4ece\u591a\u4e2a\u8868\u4e2d\u8054\u5408\u67e5\u8be2\u6570\u636e\u3002<\/p>\n

                      \n
                    • \u5185\u8fde\u63a5\uff1aSELECT column1, column2 FROM table1 INNER JOIN table2 ON table1.column_name = table2.column_name;<\/li>\n
                    • \u5de6\u8fde\u63a5\uff1aSELECT column1, column2 FROM table1 LEFT JOIN table2 ON table1.column_name = table2.column_name;<\/li>\n
                    • \u53f3\u8fde\u63a5\uff1aSELECT column1, column2 FROM table1 RIGHT JOIN table2 ON table1.column_name = table2.column_name;<\/li>\n<\/ul>\n<\/li>\n
                    • \n

                      EXISTS\u8bed\u53e5\uff1a\u7528\u4e8e\u68c0\u67e5\u5b50\u67e5\u8be2\u662f\u5426\u5b58\u5728\u7ed3\u679c\u3002<\/p>\n

                        \n
                      • \u4f7f\u7528EXISTS\u68c0\u67e5\u5b50\u67e5\u8be2\u662f\u5426\u6709\u7ed3\u679c\uff1aSELECT column1 FROM table_name WHERE EXISTS (SELECT column2 FROM table_name2 WHERE condition);<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

                        \u4ee5\u4e0a\u662f\u5e38\u7528\u7684SQL\u67e5\u8be2\u8bed\u53e5\u547d\u4ee4\u53ca\u5176\u4ee3\u7801\u793a\u4f8b\u3002\u901a\u8fc7\u638c\u63e1\u8fd9\u4e9b\u5e38\u7528\u7684\u8bed\u53e5\uff0c\u60a8\u5c06\u80fd\u591f\u66f4\u52a0\u7075\u6d3b\u5730\u8fdb\u884c\u6570\u636e\u5e93\u7684\u64cd\u4f5c\u3002\u5e0c\u671b\u8fd9\u7bc7\u6587\u7ae0\u5bf9\u60a8\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n

                        \u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u5b8c\u6574\u7684SQL\u67e5\u8be2\u8bed\u53e5\u5217\u8868\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8eSQL\u67e5\u8be2\u8bed\u53e5,SQL\u547d\u4ee4,\u547d\u4ee4\u5927\u5168\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n

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

                        \u5b8c\u6574\u7684SQL\u67e5\u8be2\u8bed\u53e5\u5217\u8868 \u672c\u7bc7\u6587...<\/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-199685","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199685","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=199685"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199685\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=199685"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=199685"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=199685"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}