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SQL Select within select

Posted on 2011-10-20
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Last Modified: 2013-12-16

select * from  --this is an example the star will be replaced with desired columns
(

--these next two selects work perfectly, they return the desired rows
--I would like to use their results in the outer select
--However, I get this error
--Msg 8156, Level 16, State 1, Line 18
--The column 'machine_id' was specified multiple times for 'finalResult'.
--Thank you for your input.

select * from [UpdateHistory] as i
inner join
(select u.machine_id, u.application_id, max(servertimestamp) as [timestamp]
from [UpdateHistory] u      
group by machine_id, application_id) p
ON
i.machine_id = p.machine_id AND
i.application_id = p.application_id AND
i.servertimestamp = p.[timestamp]

) as finalResult
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Question by:wilfordrocks
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Accepted Solution

by:
Rajkumar Gs earned 2000 total points
ID: 37000149
If your sub-query is returning more than one column with the same name, this error could occur

eg: - In 'users' table, i have a column 'user_id. * means it fetches all records, right - which includes user_id as well. In addition to that I have mentioned user_id again.
select * from
(
select *, user_id from users
) a

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