Re: user aggregate with exception handling - Mailing list pgsql-novice

j. z. wrote
> Hi. I need to apply a postgis aggregate function. Since usual usage throws
> errors, in case of error I need to use the aggregate function with another
> argument to avoid an error
>
> How can I achieve the goal?

You need to create a custom aggregate function.

http://www.postgresql.org/docs/9.2/interactive/sql-createaggregate.html

Which involves creating two normal functions ( though you can possibly
leverage an existing final func ).

David J.



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