troubleshooting Question

SQL Server Complex join

Avatar of SharonBernal
SharonBernal asked on
Microsoft SQL ServerMicrosoft SQL Server 2008
2 Comments2 Solutions333 ViewsLast Modified:
I have a query as follows:

select * from TBL1 inner join TBL2 where tb1.groupkey=tbl2.groupkey

I want to keep these records, however here's the problem, if groupkey is null or ZZ I need to execute the same select with a different table and where condition

select * from TBL1 inner join TBL3 where tb1.groupkey=tbl3.groupkey

Finally if this brings back duplicates I need to set groupkey to null.

I need help designing this query.
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