Re: NEXT VALUE FOR...

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Rod Taylor <pg(at)rbt(dot)ca>
Cc: PostgreSQL Patches <pgsql-patches(at)postgresql(dot)org>
Subject: Re: NEXT VALUE FOR...
Date: 2004-04-27 03:31:15
Message-ID: 200404270331.i3R3VFN25932@candle.pha.pa.us
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Your patch has been added to the PostgreSQL unapplied patches list at:

http://momjian.postgresql.org/cgi-bin/pgpatches

I will try to apply it within the next 48 hours.

I will probably hold it in the queue until Tom returns.

---------------------------------------------------------------------------

Rod Taylor wrote:
> It would appear the spec was approved of before we got foo.nextval, so
> here it is again.
>
> NEXT VALUE FOR and CURRENT VALUE FOR where CURRENT is an unreserved
> keyword and VALUE is not reserved in any way (ident with comparison to
> "value").
>
> This allows the default of a table to depend on a sequence, CASCADE drop
> of the sequence removes removes references to it.
>
> CURRENT VALUE FOR is an extension of the spec.
>
>
> This gives us almost everything required for the Sequence feature (T176)
> (as per the draft).
>
> We're missing the datatype specification on the sequence.
>
> CREATE SEQUENCE t AS numeric(130);
>
>
> Rod Taylor <rbt ( at ) rbt ( dot ) ca> writes:
> > Are you ok with the DB2 and draft-spec syntax of NEXT VALUE FOR (where
> > value is not a reserved word)? Or should I hold onto that until the
> > spec has gone through the final draft / release?
>
> By that time we'll have done the Oracle-style foo.nextval, and it'll
> become kind of a moot point ;-)
>
> regards, tom lane

[ Attachment, skipping... ]

>
> ---------------------------(end of broadcast)---------------------------
> TIP 9: the planner will ignore your desire to choose an index scan if your
> joining column's datatypes do not match

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