DB2 sql: where clausole : something OR (table is empty)

HI,
I would like to have
a condition where in which I test if an element is present
in a tableX OR the tableX is empty.
The where will return true if the element is present in tableX
BUT return true even if the tableX is empty.
How do I do?
thanks
bobdylan75Asked:
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bobdylan75Author Commented:
select * from tableA
where tableA.key in (select key from tableX) OR tableX is empty...

Is there a way like that..
0
Kent OlsenData Warehouse Architect / DBACommented:

Hi Bob,

SELECT * FROM tableA
WHERE tableA.key in (select key from tableX)
  OR ((Select count(*) from tablex) = 0)


Will that work?


Kent
0

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CarlsbergFTWCommented:
Try using an outer join against the table that might have null or no value ?
0
bobdylan75Author Commented:
Thank you CarlsbergFTW,
but I think the easy way is that one of Kdo.
0
bobdylan75Author Commented:
thank you!
0
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