On Thu, Jan 31, 2008 at 10:22:42AM +0000, Gregory Stark wrote:
>
> "Decibel!" <decibel@decibel.org> writes:
>
> > CLUSTER isn't DDL. Most forms of ALTER TABLE are. And CREATE blah,
> > etc.
>
> Fwiw I would call CLUSTER DDL. Note that it does make a change
> that's visible in the table definition afterwards.
>
> There are plenty of DDL commands which modify data (CREATE INDEX,
> ATLER TABLE ALTER COLUMN TYPE). The defining characteristic of DDL
> is not that it doesn't modify the data but that it does modify the
> table definition.
Counter-example: ALTER TABLE ALTER COLUMN USING will almost certainly
modify data, but it's DDL nonetheless.
> By that definition CLUSTER is DDL and TRUNCATE is DDL if you look at
> the implementation rather than the user-visible effects.
I agree that both are more DDL-like than DML-like.
Cheers,
David.
--
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