At 07:51 PM 2/26/2007, Miles Thompson wrote:
At 10:42 PM 2/25/2007, mos wrote:
At 06:13 PM 2/25/2007, Miles Thompson wrote:
Would someone please check this delete query?
This should delete all rows from the geodesic_user_data that have no
match in the subscriber table, but another set of eyes would be appreciated.
DELETE geodesic_user_data
FROM geodesic_user_data
LEFT JOIN subscriber ON
geodesic_classifieds_userdata.id=subscriber.GeoClassID
WHERE subscriber.GeoClassID IS NULL;
Our hosting company uses MySQL 4.0.17 so the subquery approach is not
possible.
Thanks in advance - Miles
Miles,
It looks fine but you could have checked it yourself using:
select *
FROM geodesic_user_data
LEFT JOIN subscriber ON
geodesic_classifieds_userdata.id=subscriber.GeoClassID
WHERE subscriber.GeoClassID IS NULL;
--
Thanks Mos, and to everyone else who responded.
I had tested it with a SELECT; it was just that other set of eyes that I
needed for confirmation.
I did what I should have donein the first place - exported the appropriate
tables with data, created them on my computer, and tested the deletes.
They worked fine.
Tomorrow evening they will get run for real.
Regards - Miles
Miles,
I always back up the data if I'm not sure what the SQL will do to it.
I use:
create table bu_MyTable select * from MyTable
This builds a backup table without the indexes so I can easily copy the
data back using an Insert statement.
Good luck tomorrow. :)
Mike
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