從內部選擇語句計數

Question

我想在SQL服務器中執行以下查詢，但出現錯誤。有人能解釋我如何計算內部選擇語句嗎？

SELECT COUNT(*) from 

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

Answer 1

我想你只是錯過了第二列的名稱：

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

Answer 2

試試下面的代碼：

SELECT COUNT(*) from 

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