SELECT only records where amount > 1

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SELECT only records where amount > 1

Author

Topic

duanecwilson
Constraint Violating Yak Guru

273 Posts

Posted - 2010-03-29 : 18:43:04

I have a simple issue, but have a mental block. If I have a table with 2 columns, WorkstationID, and Product, and I want to select ONLY those workstations with more than one product installed on them (these are Office versions). Some workstations have 2 or more versions. If the Workstation only has 1, I don't want them. So the final result will have 2 columns - WorkstationID, Product. So it will look like this:
WorkstationID, Product
1656, Office XP
1656, Office 2003
1656, Office 2007
1795, Office 2003
1795, Office 2007
1831, Office XP
1831, Office 2003
2096, Office 2003
2096, Office 2007
etc. - no entries where only 1 version installed.
I have tried various sub-queries, group by, having, etc.
Thanks in advance for helping.

Duane

DonAtWork
Master Smack Fu Yak Hacker

2167 Posts

Posted - 2010-03-30 : 09:45:32

select a.workstationid,a.product
from TABLE a
inner join
(select workstationid
from TABLE
group by workstationid
having count(*) > 1) b
on a.workstationid = b.workstationid

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