troubleshooting Question

SQL Update

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ITBeneluxFlag for Belgium asked on
Microsoft SQL Server 2005Microsoft SQL Server 2008
6 Comments1 Solution182 ViewsLast Modified:

I don't understand why my update statement is not working

I want to update table tbluser with values of tblDump, comparing the UserID's.  I put a unique index on the userID field in both tables, So I'm 100% sure there are no duplicate values.  yet.. when running the update statement. I get back 'Subquery returned more than 1 value.' ?? which should be impossible. because there is always one value for one ID ?

thx for helping me out on this one.
USE users
UPDATE tbluser
SET PartnerBirthday = (SELECT PBirthday
FROM users.dbo.tblDump
WHERE users.dbo.tblDump.userid  = users.dbo.tbluser.userid)

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