Re: Column-level triggers in docs

On 29 August 2010 15:35, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Thom Brown <thom@linux.com> writes:
>> I notice that the 9.0 docs page for CREATE TRIGGER doesn't indicate
>> column-level syntax in the synopsis:
>> http://www.postgresql.org/docs/9.0/static/sql-createtrigger.html
>
> My recollection is that we did it that way deliberately.  The originally
> submitted patch tried to explain this as part of the syntax diagram,
> but it was (a) confusing and (b) not correct in detail.

I missed the discussion is seems.

>> So it would read something like:
>
>> CREATE TRIGGER name { BEFORE | AFTER } { event [ OF column_name [, ...
>> ] ] [ OR ... ] }
>
> If you do this then it looks like "OF column_name" can be attached to
> all four event types, which is wrong.  So you end up needing just as
> much verbal annotation as in the current arrangement.

Ah, yes, I didn't consider that.  Fair enough.

--
Thom Brown
Twitter: @darkixion
IRC (freenode): dark_ixion
Registered Linux user: #516935