简单的MS SQL错误

Question

我对MS SQL非常陌生，并且试图在表中获取所有重复的电子邮件。我发现了一个适用于MySQL的类似查询，但是当它在MS SQL中运行时，我得到错误的无效列名称'ct'。

我运行的查询是：

SELECT 
    [ShipEmail], 
    COUNT(*) as ct 

FROM [ShipWorksDefault].[dbo].[Customers] GROUP BY [ShipEmail] HAVING [ct] > 1 

我猜有些事情很简单，我俯瞰。

非常感谢提前！

Answer 1

只要改变HAVING子句不使用列别名：

HAVING COUNT（*）> 1

Answer 2

SELECT 
    [ShipEmail], 
    COUNT(*) as ct 
FROM [ShipWorksDefault].[dbo].[Customers] 
GROUP BY [ShipEmail] HAVING COUNT(*) > 1 

或

SELECT 
    [ShipEmail], 
    COUNT(*) as ct 
FROM [ShipWorksDefault].[dbo].[Customers] 
GROUP BY [ShipEmail] HAVING COUNT([ShipEmail]) > 1 

Answer 3

不能使用的别名有条款。请尝试：

SELECT 
    [ShipEmail], 
    COUNT(*) as ct 

FROM [ShipWorksDefault].[dbo].[Customers] GROUP BY [ShipEmail] HAVING COUNT(*) > 1