简单的MS SQL Bug

Question

我是MS SQL的新手，我试图在表格中获取所有重复的电子邮件。我找到了一个适用于MySQL的类似查询，但是当它在MS SQL中运行时，我得到错误无效的列名'ct'。

我运行的查询是：

SELECT   
  [ShipEmail], 
  COUNT(*) as ct

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

我猜我有一些非常简单的东西。

非常感谢提前！

Answer 1

只需将HAVING子句更改为不使用列别名：

有计数（*）＆gt; 1

Answer 2

您不能在having子句中使用别名。尝试：

SELECT   
  [ShipEmail], 
  COUNT(*) as ct

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

Answer 3

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