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Here is another example that just shows a little more what you can do with subselects:
Select *
From astccdta.oetra99 t1
Where Exists( Select 1 from astccdta.oetra99 T2 Where T2.otord# = T1.Otord# and T2.ottrnc = 'CVC' Fetch First 1 Rows Only)
And Exists( Select 1 from astccdta.oetra99 T2 Where T2.otord# = T1.Otord# and T2.ottrnc = 'GRE' Fetch First 1 Rows Only)
And Not Exists( Select 1 from astccdta.oetra99 T2 Where T2.otord# = T1.Otord# and T2.ottrnc Not IN ('CVC','GRE') Fetch First 1 Rows Only)
IME using the "Exists" clause instead of the "In" clause in a scenario like this one performs better.
Especially where you don't care how many records exist with the key value, just that one exists.
Also, this query is more complicated than what has already been suggested.
It would probably only be a good solution if the subselects were more complicated and included extra table joins that you didn't want in the outer select.
Chris Hiebert
Senior Programmer/Analyst
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