{"id":41384,"date":"2023-10-10T23:20:12","date_gmt":"2023-01-15T18:20:53","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/postgresql%e7%9a%84%e5%88%86%e7%bb%84\/"},"modified":"2024-01-15T10:56:11","modified_gmt":"2024-01-15T02:56:11","slug":"postgresql%e7%9a%84%e5%88%86%e7%bb%84","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/postgresql%e7%9a%84%e5%88%86%e7%bb%84\/","title":{"rendered":"PostgreSQL\u7684\u5206\u7ec4"},"content":{"rendered":"

\u5173\u4e8eSQL\u7684GROUP BY
\n\u901a\u8fc7\u4f2a\u5206\u9694\uff0c
\n\u9009\u62e9genre,
\nCOUNT(genre)
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\n\u6309\u7167genre\u8fdb\u884c\u5206\u7ec4\uff1b
\n\u8fd9\u6837\u5206\u7ec4\u540e\u7684\u5404\u4e2agenre\u90fd\u4f1a\u88ab\u8ba1\u6570\uff0c\u5e76\u663e\u793a\u51fagenre\u548c\u5bf9\u5e94\u7684\u6570\u91cf\u3002<\/p>\n

\u5386\u53f2\u4e66\u7c4d\u7684\u8ba1\u6570\u4e3a1\uff0c\u6280\u672f\u4e66\u7c4d\u7684\u8ba1\u6570\u4e3a2\uff0c\u6f2b\u753b\u7684\u8ba1\u6570\u4e5f\u662f2\u3002\u8bf7\u6ce8\u610f\u865a\u62df\u5730\u5206\u9694\u53e5\u5b50\u3002<\/p>\n

\u6211\u4e0d\u77e5\u9053\u5199\u4e86\u4ec0\u4e48\u5185\u5bb9\uff0c\u6240\u4ee5\u9700\u8981\u65e5\u540e\u6574\u7406\u548c\u7f16\u8f91\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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