删除SQL Server中的重复记录
问题描述：
我写了一个查询，从表中删除重复的记录
I have written a query to remove duplicate records from a table
;WITH a as
(
SELECT Firstname,ROW_NUMBER() OVER(PARTITION by Firstname, empID ORDER BY Firstname)
AS duplicateRecCount
FROM dbo.tblEmployee
)
--Now Delete Duplicate Records
DELETE FROM tblEmployee
WHERE duplicateRecCount > 1
但是我不知道我在哪里错了，这是在说
But I don't know where I went wrong it is saying
无效的列名称
duplicateRecCount
有人可以帮助我吗?
答
您需要在delete语句中引用CTE ...
You need to reference the CTE in the delete statement...
WITH a as
(
SELECT Firstname,ROW_NUMBER() OVER(PARTITION by Firstname, empID ORDER BY Firstname)
AS duplicateRecCount
FROM dbo.tblEmployee
)
--Now Delete Duplicate Records
DELETE FROM a
WHERE duplicateRecCount > 1