Mark Kirkwood wrote:
Jim C. Nasby wrote:
On Sun, Jan 08, 2006 at 04:13:01PM +1300, Mark Kirkwood wrote:
What happens if someone deletes the row between the failed insert and
the second update? :)
In this example the rows in the summary table never get deleted by
DELETE operations on that main one - the trigger just decrements the
various amounts - i.e DELETE becomes UPDATE, so no problem there.
Sorry Jim, I just realized you probably meant someone directly deleting
rows in the summary table itself. Well yes, that would certainly fox it!
I guess I was implicitly considering a use case where the only direct
DML on the summary table would be some sort of ETL process, which would
probably lock out other changes (and re-create the summary table data
afterwards in all likelihood).
Cheers
Mark
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