Doesn't the following allow a race condition?
>declare foo record;
>begin
> select into foo * from overview...
> if not found
> insert...
> else ...
> end if;
>end;
ISTM 2 or more clients could attempt to insert the same row, based on the select failing, if all were issued at the
sametime. I've always assumed that, there being no row to lock in a _failed_ search, even saying SELECT ... FOR UPDATE
inthis case is no help.
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