{"id":206802,"date":"2025-06-12T12:00:26","date_gmt":"2025-06-12T04:00:26","guid":{"rendered":"https:\/\/server.hk\/cnblog\/206802\/"},"modified":"2025-06-12T12:00:26","modified_gmt":"2025-06-12T04:00:26","slug":"%e4%bd%bf%e7%94%a8-distinct-%e6%9f%a5%e8%af%a2%e6%97%b6%ef%bc%8c%e7%b4%a2%e5%bc%95%e5%af%b9%e7%bb%93%e6%9e%9c%e6%8e%92%e5%ba%8f%e7%9a%84%e5%bd%b1%e5%93%8d%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/206802\/","title":{"rendered":"\u4f7f\u7528 DISTINCT \u67e5\u8be2\u65f6\uff0c\u7d22\u5f15\u5bf9\u7ed3\u679c\u6392\u5e8f\u7684\u5f71\u54cd\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"

\u5404\u4f4d\u5c0f\u4f19\u4f34\u4eec\uff0c\u5927\u5bb6\u597d\u5440\uff01\u770b\u770b\u4eca\u5929\u6211\u53c8\u7ed9\u5404\u4f4d\u5e26\u6765\u4e86\u4ec0\u4e48\u6587\u7ae0\uff1f\u672c\u6587\u6807\u9898\u662f<\/span>\u300a\u4f7f\u7528 DISTINCT \u67e5\u8be2\u65f6\uff0c\u7d22\u5f15\u5bf9\u7ed3\u679c\u6392\u5e8f\u7684\u5f71\u54cd\u662f\u4ec0\u4e48\uff1f \u300b<\/span>\uff0c\u5f88\u660e\u663e\u662f\u5173\u4e8eGOLANG<\/span>\u7684\u6587\u7ae0\u54c8\u54c8\u54c8\uff0c\u5176\u4e2d\u5185\u5bb9\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\uff0c\u5982\u679c\u80fd\u5e2e\u5230\u4f60\uff0c\u89c9\u5f97\u5f88\u4e0d\u9519\u7684\u8bdd\uff0c\u6b22\u8fce\u5404\u4f4d\u591a\u591a\u70b9\u8bc4\u548c\u5206\u4eab\uff01<\/span>,
\n,
\n\u7d22\u5f15\u5bf9 DISTINCT \u6392\u5e8f\u7684\u5f71\u54cd<\/strong>,\u5728\u8fdb\u884c DISTINCT \u67e5\u8be2\u65f6\uff0c\u6392\u5e8f\u987a\u5e8f\u901a\u5e38\u53d6\u51b3\u4e8e\u67e5\u8be2\u6240\u4f7f\u7528\u7684\u7d22\u5f15\u3002\u5728\u6ca1\u6709\u6307\u5b9a ORDER BY \u5b50\u53e5\u7684\u60c5\u51b5\u4e0b\uff0c\u6392\u5e8f\u987a\u5e8f\u662f\u7531\u6570\u636e\u5e93\u5f15\u64ce\u51b3\u5b9a\u7684\u3002,\u5bf9\u4e8e InnoDB \u5b58\u50a8\u5f15\u64ce\uff0c\u5f53\u6ca1\u6709\u5339\u914d\u7684\u4e8c\u7ea7\u7d22\u5f15\u65f6\uff0c\u67e5\u8be2\u4f1a\u4f7f\u7528\u4e3b\u952e\u7d22\u5f15\uff0c\u5e76\u4e14\u6392\u5e8f\u987a\u5e8f\u6309\u7167\u4e3b\u952e\u503c\u5347\u5e8f\u3002\u5f53\u4f7f\u7528\u4e8c\u7ea7\u7d22\u5f15\u65f6\uff0c\u6392\u5e8f\u987a\u5e8f\u5c06\u6309\u7167\u4e8c\u7ea7\u7d22\u5f15\u7684\u987a\u5e8f\u8fdb\u884c\u3002,\u5728\u793a\u4f8b\u4e2d\uff0c\u5728\u6dfb\u52a0\u4e86 Province \u5217\u7684\u7d22\u5f15\u540e\uff0c\u67e5\u8be2\u7ed3\u679c\u7684\u6392\u5e8f\u987a\u5e8f\u53d1\u751f\u4e86\u53d8\u5316\u3002\u8fd9\u662f\u56e0\u4e3a\u67e5\u8be2\u73b0\u5728\u4f7f\u7528\u4e86 Province \u7d22\u5f15\uff0c\u800c\u4e0d\u662f\u4e3b\u952e\u7d22\u5f15\u3002\u56e0\u6b64\uff0c\u7ed3\u679c\u6309\u7167 Province \u7d22\u5f15\u7684\u987a\u5e8f\u8fdb\u884c\u6392\u5e8f\uff0c\u800c\u4e0d\u662f\u6309\u7167\u4e3b\u952e\u503c\u5347\u5e8f\u3002,\u8fd9\u79cd\u884c\u4e3a\u7b26\u5408 SQL \u6807\u51c6\uff0c\u5176\u4e2d\u672a\u6307\u5b9a\u4e0d\u4f7f\u7528 ORDER BY \u5b50\u53e5\u65f6\u7684\u6392\u5e8f\u987a\u5e8f\u3002\u6392\u5e8f\u7531\u6570\u636e\u5e93\u5f15\u64ce\u7684\u5e95\u5c42\u5b58\u50a8\u7ed3\u6784\u51b3\u5b9a\u3002\u5728 InnoDB \u7684\u60c5\u51b5\u4e0b\uff0c\u5b83\u662f\u6309\u7167\u67e5\u8be2\u6240\u7528\u7d22\u5f15\u7684\u987a\u5e8f\u6765\u6392\u5e8f\u7684\u3002,\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u4f7f\u7528 DISTINCT \u67e5\u8be2\u65f6\uff0c\u7d22\u5f15\u5bf9\u7ed3\u679c\u6392\u5e8f\u7684\u5f71\u54cd\u662f\u4ec0\u4e48\uff1f \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\u6ce8GOLANG\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01,\u7d22\u5f15\u5bf9 DISTINCT \u6392\u5e8f\u7684\u5f71\u54cd,
\n\u5404\u4f4d\u5c0f\u4f19\u4f34\u4eec\uff0c\u5927\u5bb6\u597d\u5440\uff01\u770b\u770b\u4eca\u5929\u6211\u53c8\u7ed9\u5404\u4f4d\u5e26\u6765\u4e86\u4ec0\u4e48\u6587\u7ae0\uff1f\u672c\u6587\u6807\u9898\u662f<\/span>\u300a\u4f7f\u7528 DISTINCT \u67e5\u8be2\u65f6\uff0c\u7d22\u5f15\u5bf9\u7ed3\u679c\u6392\u5e8f\u7684\u5f71\u54cd\u662f\u4ec0\u4e48\uff1f \u300b<\/span>\uff0c\u5f88\u660e\u663e\u662f\u5173\u4e8eGOLANG<\/span>\u7684\u6587\u7ae0\u54c8\u54c8\u54c8\uff0c\u5176\u4e2d\u5185\u5bb9\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\uff0c\u5982\u679c\u80fd\u5e2e\u5230\u4f60\uff0c\u89c9\u5f97\u5f88\u4e0d\u9519\u7684\u8bdd\uff0c\u6b22\u8fce\u5404\u4f4d\u591a\u591a\u70b9\u8bc4\u548c\u5206\u4eab\uff01<\/span>,
\n<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u4f7f\u7528 DISTINCT \u67e5\u8be2\u65f6\uff0c\u7d22\u5f15\u5bf9\u7ed3\u679c\u6392\u5e8f\u7684\u5f71\u54cd\u662f\u4ec0\u4e48\uff1f <\/span><\/p>\n

\u4f7f\u7528 DISTINCT \u67e5\u8be2\u65f6\uff0c\u7d22\u5f15\u5bf9\u7ed3\u679c\u6392\u5e8f\u7684\u5f71\u54cd\u662f\u4ec0\u4e48\uff1f <\/h1>\n

2024-11-24 09:27:28<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u5404\u4f4d\u5c0f\u4f19\u4f34\u4eec\uff0c\u5927\u5bb6\u597d\u5440\uff01\u770b\u770b\u4eca\u5929\u6211\u53c8\u7ed9\u5404\u4f4d\u5e26\u6765\u4e86\u4ec0\u4e48\u6587\u7ae0\uff1f\u672c\u6587\u6807\u9898\u662f<\/span>\u300a\u4f7f\u7528 DISTINCT \u67e5\u8be2\u65f6\uff0c\u7d22\u5f15\u5bf9\u7ed3\u679c\u6392\u5e8f\u7684\u5f71\u54cd\u662f\u4ec0\u4e48\uff1f \u300b<\/span>\uff0c\u5f88\u660e\u663e\u662f\u5173\u4e8eGOLANG<\/span>\u7684\u6587\u7ae0\u54c8\u54c8\u54c8\uff0c\u5176\u4e2d\u5185\u5bb9\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\uff0c\u5982\u679c\u80fd\u5e2e\u5230\u4f60\uff0c\u89c9\u5f97\u5f88\u4e0d\u9519\u7684\u8bdd\uff0c\u6b22\u8fce\u5404\u4f4d\u591a\u591a\u70b9\u8bc4\u548c\u5206\u4eab\uff01<\/span><\/p>\n

<\/p>\n

\u7d22\u5f15\u5bf9 DISTINCT \u6392\u5e8f\u7684\u5f71\u54cd<\/strong><\/p>\n

\u5728\u8fdb\u884c DISTINCT \u67e5\u8be2\u65f6\uff0c\u6392\u5e8f\u987a\u5e8f\u901a\u5e38\u53d6\u51b3\u4e8e\u67e5\u8be2\u6240\u4f7f\u7528\u7684\u7d22\u5f15\u3002\u5728\u6ca1\u6709\u6307\u5b9a ORDER BY \u5b50\u53e5\u7684\u60c5\u51b5\u4e0b\uff0c\u6392\u5e8f\u987a\u5e8f\u662f\u7531\u6570\u636e\u5e93\u5f15\u64ce\u51b3\u5b9a\u7684\u3002<\/p>\n

\u5bf9\u4e8e InnoDB \u5b58\u50a8\u5f15\u64ce\uff0c\u5f53\u6ca1\u6709\u5339\u914d\u7684\u4e8c\u7ea7\u7d22\u5f15\u65f6\uff0c\u67e5\u8be2\u4f1a\u4f7f\u7528\u4e3b\u952e\u7d22\u5f15\uff0c\u5e76\u4e14\u6392\u5e8f\u987a\u5e8f\u6309\u7167\u4e3b\u952e\u503c\u5347\u5e8f\u3002\u5f53\u4f7f\u7528\u4e8c\u7ea7\u7d22\u5f15\u65f6\uff0c\u6392\u5e8f\u987a\u5e8f\u5c06\u6309\u7167\u4e8c\u7ea7\u7d22\u5f15\u7684\u987a\u5e8f\u8fdb\u884c\u3002<\/p>\n

\u5728\u793a\u4f8b\u4e2d\uff0c\u5728\u6dfb\u52a0\u4e86 Province \u5217\u7684\u7d22\u5f15\u540e\uff0c\u67e5\u8be2\u7ed3\u679c\u7684\u6392\u5e8f\u987a\u5e8f\u53d1\u751f\u4e86\u53d8\u5316\u3002\u8fd9\u662f\u56e0\u4e3a\u67e5\u8be2\u73b0\u5728\u4f7f\u7528\u4e86 Province \u7d22\u5f15\uff0c\u800c\u4e0d\u662f\u4e3b\u952e\u7d22\u5f15\u3002\u56e0\u6b64\uff0c\u7ed3\u679c\u6309\u7167 Province \u7d22\u5f15\u7684\u987a\u5e8f\u8fdb\u884c\u6392\u5e8f\uff0c\u800c\u4e0d\u662f\u6309\u7167\u4e3b\u952e\u503c\u5347\u5e8f\u3002<\/p>\n

\u8fd9\u79cd\u884c\u4e3a\u7b26\u5408 SQL \u6807\u51c6\uff0c\u5176\u4e2d\u672a\u6307\u5b9a\u4e0d\u4f7f\u7528 ORDER BY \u5b50\u53e5\u65f6\u7684\u6392\u5e8f\u987a\u5e8f\u3002\u6392\u5e8f\u7531\u6570\u636e\u5e93\u5f15\u64ce\u7684\u5e95\u5c42\u5b58\u50a8\u7ed3\u6784\u51b3\u5b9a\u3002\u5728 InnoDB \u7684\u60c5\u51b5\u4e0b\uff0c\u5b83\u662f\u6309\u7167\u67e5\u8be2\u6240\u7528\u7d22\u5f15\u7684\u987a\u5e8f\u6765\u6392\u5e8f\u7684\u3002<\/p>\n

\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u4f7f\u7528 DISTINCT \u67e5\u8be2\u65f6\uff0c\u7d22\u5f15\u5bf9\u7ed3\u679c\u6392\u5e8f\u7684\u5f71\u54cd\u662f\u4ec0\u4e48\uff1f \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\u6ce8GOLANG\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n

\n
\n <\/dt>\n
\n \u7f51\u6613\u90ae\u7bb1\u7535\u8111\u7248\u767b\u5f55\u5165\u53e3\uff1f\n <\/dd>\n<\/dl>\n
\n
\n <\/dt>\n
\n \u5982\u4f55\u5728\u7535\u8111\u4e0a\u6a21\u62dfiOS\u7cfb\u7edf\uff1f\u5b9e\u73b0iPhone\u5728\u7535\u8111\u4e0a\u8fd0\u884c\u7684\u65b9\u6cd5\u5206\u4eab\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"

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