sql-server – 如何为SUM列指定名称？

如何为SUM列分配列名？

即

select OwnerUserId,SUM(PostScore)
INTO Experts
from ...

我收到此错误：

An object or column name is missing or
empty. For SELECT INTO statements,
verify each column has a name. For
other statements,look for empty alias
names. Aliases defined as “” or [] are
not allowed. Change the alias to a
valid name.

我想因为包含SUM结果的列没有名称.

解决方法

至于名称 – 称为别名 – 您可以使用AS.这是标准的SQL语法：

SELECT OwnerUserId,SUM(PostScore) AS PostScoreSum
INTO Experts 
FROM ...

但AS是可选的,因此您也可以在没有它的情况下为列添加别名：

SELECT OwnerUserId,SUM(PostScore)  PostScoreSum
INTO Experts 
FROM ...

您还可以使用(专有的,仅在SQL-Server中)alias = column语法：

SELECT OwnerUserId,PostScoreSum = SUM(PostScore)  
INTO Experts 
FROM ...

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