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  1.  Home
  2. MIDRANGE-L
  3. June 2013

RE: SQL Exists for Flag

Try this:

SELECT a.Fld1, a.Fld2,
CASE
WHEN b.Fld1 IS NULL THEN ''
ELSE 'X'
END
FROM TableA a
LEFT OUTER JOIN TableB b ON a.Fld1 = b.Fld1


Have fun!
Richard


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Michael Ryan
Sent: Thursday, June 20, 2013 11:49 AM
To: Midrange Systems Technical Discussion
Subject: SQL Exists for Flag

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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