On 10/17/12 10:46 AM, Greg Stark wrote:
> Warning: RULES are tricky to use correctly. They rewrite the original
> query into a new query before it is run and it is very hard to
> correctly anticipate and rewrite every possible input query into the
> desired result. There are also unexpected interactions with other
> components when RULES do something unexpected such as rewrite a single
> query to return two result sets.
>
> For most applications it's much simpler and more predictable to use
> TRIGGERs. ROW level triggers are evaluated for each row the original
> query is about to process (or has just finished processing) and this
> makes them much easier to follow. Statement level TRIGGERs can be used
> for audit logs and similar operations which need to run once per
> statement.
as a relative novice, I concur, this is clear, concise, and to the point.
--
john r pierce N 37, W 122
santa cruz ca mid-left coast
