How can I assign a name to the SUM column?

Question

how can I assign a column name to the SUM column ?

i.e.

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

I get this error:

Answer 1

First of all there's no SQL-Server 2003. Only 2000, 2005, 2008 (and then 2008R2, 2012 and the latest 2014).

As for the name - called alias - you can use AS. This is the standard SQL syntax:

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

But AS is optional, so you can also alias a column without it:

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

You can also use the (proprietary, only in SQL-Server) alias = column syntax:

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

Answer 2

You can alias any column, computed or not by using the AS keyword:

SELECT OwnerUserId AS MyUserId, SUM(PostScore) As Score
INTO Experts
from ...

Answer 3

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

or

select OwnerUserId, SUM(PostScore) [mySum]
INTO Experts
from ...