从内部选择语句计数

Question

我想在SQL服务器中执行以下查询，但出现错误。有人能解释我如何计算内部选择语句吗？

SELECT COUNT(*) from 

(Select ID, 
     COUNT(ID) 
    FROM [Testing].[dbo].[Bench] group by ID having COUNT(*) =5); 

Answer 1

我想你只是错过了第二列的名称：

SELECT COUNT(*) 
FROM (
    Select id, COUNT(id) count_of_id 
    FROM [Testing].[dbo].[Bench] 
    GROUP BY id 
    HAVING COUNT(*) =5 
); 

Answer 2

试试下面的代码：

SELECT COUNT(*) from 

(Select ID, 
     COUNT(ID) as cnt 
    FROM [Testing].[dbo].[Bench] group by ID having COUNT(*) =5) tbl;