Select within update

When am I missing in order to get the below working?

Update dbo.Name
Set CombineID = NULL
where
SELECT CombineID
from dbo.Name
GROUP By CombineID
Having count(CombineID)<=1
PeterErhardAsked:
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Aneesh RetnakaranConnect With a Mentor Database AdministratorCommented:
Did you try the Queries i have given
For testing purpose run this

BEGIN TRAN

SELECT CombineID, Count(*) as [Count]
from dbo.Name
GROUP By CombineID
Having count(CombineID)<=1

Update dbo.Name
Set CombineID = NULL
where CombineID In (
SELECT CombineID
from dbo.Name
GROUP By CombineID
Having count(CombineID)<=1 )

SELECT CombineID, Count(*) as [Count]
from dbo.Name
GROUP By CombineID
Having count(CombineID)<=1

ROLLBACK TRAN
0
 
Aneesh RetnakaranDatabase AdministratorCommented:
Hi PeterErhard,


Update dbo.Name
Set CombineID = NULL
where CombineID In (
SELECT CombineID
from dbo.Name
GROUP By CombineID
Having count(CombineID)<=1 )





Cheers!
0
 
PeterErhardAuthor Commented:
Thanks, but get this now:

Server: Msg 116, Level 16, State 1, Line 1
Only one expression can be specified in the select list when the subquery is not introduced with EXISTS.
0
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Aneesh RetnakaranDatabase AdministratorCommented:
can i know the exact query you tried ?
0
 
PeterErhardAuthor Commented:
As above and below:

Update dbo.Name
Set CombineID = NULL
where CombineID In (
SELECT CombineID, count(CombineID) as test
from dbo.Name
GROUP By CombineID
Having count(CombineID)<=1 )
0
 
Aneesh RetnakaranDatabase AdministratorCommented:
remove that Count(CombineID) from the inner query

Update dbo.Name
Set CombineID = NULL
where CombineID In (
SELECT CombineID
from dbo.Name
GROUP By CombineID
Having count(CombineID)<=1 )
0
 
PeterErhardAuthor Commented:
I need that, it's critical to the update statement.
0
 
Aneesh RetnakaranDatabase AdministratorCommented:
PeterErhard,
> I need that, it's critical to the update statement.
 Can I know what you are trying to do ?  Where this is used  ?
I assume that the 'Test' value is used to update some other columns

Update a
Set CombineID = NULL
--, SomeOtherField  = t.Test
FROM dbo.Name A
INNER JOIN (
SELECT CombineID, count(CombineID) as test
from dbo.Name
GROUP By CombineID
Having count(CombineID)<=1 )T
ON A.CombineID = T.CombineID
0
 
PeterErhardAuthor Commented:
There's a field within the Name table named CombineID. If there are less or equal to 1 CombineID the same, then I want to set those CombineIDs to NULL.

and Nope, that's the full query.
0
 
PeterErhardAuthor Commented:
As an example, you could have CombineIDs like this:

1
2
4
1
6
8
5
23

Then are running the update statement it should finish up like this:

<<NULL>>
2
4
<<NULL>>
6
8
5
23
0
 
PeterErhardAuthor Commented:
Thanks, worked perfectly :)
0
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