entity framework中分组查询生成的sql加常数列（1 AS [C1]）的意义是什么？
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关闭于 2016-03-25 21:25
1 SELECT 2 1 AS [C1], 3 [GroupBy1].[K1] AS [AdAssignId], 4 [GroupBy1].[A1] AS [C2] 5 FROM ( SELECT 6 [Extent1].[AdAssignId] AS [K1], 7 COUNT(1) AS [A1] 8 FROM [dbo].[AdAssign] AS [Extent1] 9 WHERE 0 = (DATEDIFF (day, [Extent1].[AddDate], '2015-07-07')) 10 GROUP BY [Extent1].[AdAssignId] 11 ) AS [GroupBy1]
使用entity framework进行分组查询时，提取生成的sql，发现sql中加入了常数列(1 AS [C1]，这样做的意义是什么？
