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SQL中Group分组获取Top N 方法实现

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Release： 2016-06-07 17:43:34
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有产品表，包含id，name，city，addtime四个字段，因报表需要按城市分组，统计每个城市的最新10个产品，便向该表中插入了100万数据，做了如下系列测试： . ( ( 1 , 1 ) NOT NULL , ( 50 ) NULL , , ( 10 ) NULL , ( ) , IGNORE_DUP_KEY , ALLOW_PAGE_LOCKS )

有产品表，包含id，name，city，addtime四个字段，香港服务器，因报表需要按城市分组，统计每个城市的最新10个产品，便向该表中插入了100万数据，做了如下系列测试：

.( (1,1) NOT NULL, (50) NULL, , (10) NULL, ( ), IGNORE_DUP_KEY , ALLOW_PAGE_LOCKS ) ，美国空间，香港服务器租用

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Group accomplish method Obtain
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