Re: SQL Exists for Flag

[Charles Wilt <charles.wilt@xxxxxxxxx>]

select a.fld1, a.fld2, coalesce(b.fld1,'X')
from tbla A left outer join tblb b on (a.fld1 = b.fld1)

Charles


On Thu, Jun 20, 2013 at 11:48 AM, Michael Ryan <michaelrtr@xxxxxxxxx> wrote:

> Here's what I want to do...TableA has 4 columns. TableB shares a key value
> with TableA. I want to produce this output in a select statement (to be
> used from PHP fwiw):
>
> TableA.Fld1 TableA.Fld2 'X' (if TableA.Fld1 is in TableB).
>
> I've been trying combinations of a CTE, CASE, and exists, but I can't get
> this to work. I'd like:
>
> A1 A2
> A3 A4 X
> A5 A6 X
> A7 A8
>
> IOW, I want the values for TableA to show up, and an X if the corresponding
> key value is in TableB. This has to be easier than I'm making it out to be.
>
> Thanks!
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