小编Kev*_*vin的帖子

我有这个查询,但是当我尝试在LINQ中编写等效的时候,我得到了不正确的SQL.

我的查询是:

SELECT COUNT(*)
FROM tableName
GROUP BY ColumnId

我试过把它写成:

tableName.GroupBy(x => x.ColumnId).Count()

但是看看LINQPad它正在生成SQL:

SELECT COUNT(*) AS [value]
FROM (
SELECT NULL AS [EMPTY]
FROM [tableName] AS [t0]
GROUP BY [t0].[ColumnId]
) AS [t1]

我究竟做错了什么？谢谢!