Question

基本上我做了查询而且没有用 'Msg 156，Level 15，State 1，Line 2 关键字'FROM''

附近的语法不正确

SELECT COUNT(*)
FROM
(
SELECT Group_ID, count(ID)
FROM dbo.S1_Users
WHERE Service_Plan = 'Multi User Foreign (B)'
GROUP BY Group_ID
HAVING count(ID) = 1
)

我知道修复很简单，我搜索了谷歌但未能找到合适的

任何机构都可以解释一下吗？

Answer 1

您需要命名虚拟表并从内部查询

中命名count(ID)列

SELECT COUNT(*)
FROM
(
SELECT Group_ID, count(ID) as ID_Count
FROM dbo.S1_Users
WHERE Service_Plan = 'Multi User Foreign (B)'
GROUP BY Group_ID
HAVING count(ID) = 1
) as A

您也可以完全删除计数，而不是使用它

SELECT COUNT(*)
FROM
(
SELECT Group_ID
FROM dbo.S1_Users
WHERE Service_Plan = 'Multi User Foreign (B)'
GROUP BY Group_ID
HAVING count(ID) = 1
) as A

Answer 2

试试这样：

SELECT COUNT(*)
FROM
(
    SELECT Group_ID, count(ID) As cnt
    FROM dbo.S1_Users
    WHERE Service_Plan = 'Multi User Foreign (B)'
    GROUP BY Group_ID
    HAVING count(ID) = 1
) A

无法查询查询？

2 个答案: