| From: | David G Johnston <david(dot)g(dot)johnston(at)gmail(dot)com> |
|---|---|
| To: | pgsql-novice(at)postgresql(dot)org |
| Subject: | Re: user aggregate with exception handling |
| Date: | 2014-07-11 14:27:13 |
| Message-ID: | 1405088833441-5811289.post@n5.nabble.com |
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| Lists: | 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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