Re: [HACKERS] Adding the optional clause 'AS' in CREATE TRIGGER

On 11/14/16 8:51 PM, Tom Lane wrote:
> 1. The impression I have is that most people write trigger functions
> so that they can be shared across multiple uses.  That'd be impossible
> with anonymous trigger function blocks.  So you'd be trading off merging
> two commands into one, versus having to write out the whole body of the
> trigger multiple times, which wouldn't be much of a win.

I've fairly frequently needed one-off triggers, usually to do some kind 
of data validation that wasn't suitable in a CHECK constraint. Enough so 
that twice now[1] I've created generic trigger functions that allow you 
to specify an arbitrary expression to test against NEW and OLD.

1: Second, WIP example: 
https://github.com/decibel/tg_sanity/blob/master/sql/tg_sanity.sql
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Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
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