Gordon Ross <gr306@ucs.cam.ac.uk> wrote:
> (I'm using Postgres 8.3)
>
> I have a trigger that references a custom variable. Most of the time this
> custom variable is set, and I have no problems.
>
> However, in certain corner cases the custom variable is not set and the
> trigger fails.
>
> Is there a way to either test if the custom variable is set, or to specify a
> global default for the custom variable ?
I think, you can use COALESCE(your_variable, default_value) to solve
that problem. Try it, it is untested.
Andreas
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