簡單的MS SQL錯誤

Question

我對MS SQL非常陌生，並且試圖在表中獲取所有重複的電子郵件。我發現了一個適用於MySQL的類似查詢，但是當它在MS SQL中運行時，我得到錯誤的無效列名稱'ct'。

我運行的查詢是：

SELECT 
    [ShipEmail], 
    COUNT(*) as ct 

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

我猜有些事情很簡單，我俯瞰。

非常感謝提前！

Answer 1

只要改變HAVING子句不使用列別名：

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

不能使用的別名有條款。請嘗試：

SELECT 
    [ShipEmail], 
    COUNT(*) as ct 

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