sql - 从内部选择语句计数

Question

我正在尝试在 SQL Server 中执行以下查询，但出现错误。有人可以解释一下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

我想您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;