Re: SQL Exists for Flag

[Michael Ryan <michaelrtr@xxxxxxxxx>]

Hey Vern -

But the condition isn't that TableB.Fld1 is null, it's that the key value
TableA.Fld1 is found in TableB.


On Thu, Jun 20, 2013 at 1:01 PM, Vern Hamberg <vhamberg@xxxxxxxxxxxxxxx>wrote:

> Hi Michael
>
> That's what this should do - a LEFT OUTER JOIN will give you all records
> from TableA and TableB, if there is a match - NULLs, otherwise.
>
> Give it a try. You might like it almost as much as 7Up!
>
> Vern
>
> ----- Original Message -----
> Thanks guys...I didn't explain myself well. I want to display the values
> from TableA, and an 'X' if the key in TableA is found in TableB.
>
>
> On Thu, Jun 20, 2013 at 12:27 PM, Vern Hamberg <vhamberg@xxxxxxxxxxxxxxx
> > wrote:
>
> > Left outer JOIN, I think.
> >
> > select tablea.fld1, tablea.fld2, case when TableB.fld1 is null then ' '
> > else 'X' end from tablea join tableb on tablea.fld1 = tableb.fld1
> >
> > Check the syntax of the CASE - I'm doing this from memory.
> >
> > HTHAW (hope this helps and works)
> > Vern
> >
> > ----- Original Message -----
> > 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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