From: Rick James
Date: November 30 2012 12:13am
Subject: RE: Update One of Three tables in a single query
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Some combo of IN, EXISTS, UNION?  It will probably be verbose.

> -----Original Message-----
> From: Andrew Moore [mailto:eroomydna@stripped]
> Sent: Thursday, November 29, 2012 11:32 AM
> To: Chris W
> Cc: MYSQL General List
> Subject: Re: Update One of Three tables in a single query
>=20
> What's your use case? I've not heard of a like this done at table/sql
> level.
>=20
> You could use stored procedures & dynamic SQL to achieve it though.
>=20
>=20
> On Thu, Nov 29, 2012 at 5:44 PM, Chris W <4rfvgy7@stripped> wrote:
>=20
> > I have three tables, TableA, TableB, and TableC each has a unique ID
> > field, idA, idB, idC respectively each table also has a field called
> > 'Status'.  The id field is always greater than zero.  Now suppose I
> have
> > three variables A, B, and C.   Two of them are zero and the other is
> a
> > valid ID for the corresponding table.  Only I don't know which one.
> > Is there a way to write a single update statement that will update
> > only the one table that has the matching ID?  I have tired a few
> > different ideas but none seem worth mentioning here since they all
> > either update too many records or don't update any records.
> >
> > Thanks for the help.
> >
> > Chris W
> >
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