Re: SEQUENCEs and NO MAXVALUE NO MINVALUE
От | Rod Taylor |
---|---|
Тема | Re: SEQUENCEs and NO MAXVALUE NO MINVALUE |
Дата | |
Msg-id | 1043291592.83856.225.camel@jester обсуждение исходный текст |
Ответ на | Re: SEQUENCEs and NO MAXVALUE NO MINVALUE (Tom Lane <tgl@sss.pgh.pa.us>) |
Список | pgsql-patches |
On Wed, 2003-01-22 at 20:37, Tom Lane wrote: > Rod Taylor <rbt@rbt.ca> writes: > > Adds in NO MAXVALUE and NO MINVALUE options for create sequence per 200X > > spec, which will also make alter sequence a touch easier. > > What are these supposed to do exactly? There is no such animal as a > sequence that hasn't got a maxvalue, nor one without a minvalue. > "Large" does not mean "unlimited". 6) Case: a) If <sequence generator maxvalue option> is specified, then Case: i) If NO MAXVALUE is specified, then let SMAX be an implementation-defined <signed numeric literal> of declared type DT. ii) Otherwise, let SMAX be <sequence generator max value>. b) Otherwise, let SMAX be an implementation-defined <signed numeric literal> of declared type DT. 7) Case: a) If <sequence generator minvalue option> is specified, then Case: i) If NO MINVALUE is specified, then let SMIN be an implementation-defined <signed numeric literal> of declared type DT. ii) Otherwise, let SMIN be <sequence generator min value>. b) Otherwise, let SMIN be an implementation-defined <signed numeric literal> of declared type DT. > I'm not eager to pick up evidently-poorly-thought-out features from a > draft spec that is nowhere near being frozen. These 2 particular items are to spec, with the exception that we don't stop at the limit of the datatype, int4's have int8 limits. I think we need an ALTER SEQUENCE command, especially once dependencies are fully tracked on them. This will include some method of returning to the defaults. > Anyway, didn't we decide that converging syntax with 200X was a > bad idea if we weren't going to converge semantics? Too late for that. The rest of the create sequence syntax is in-line with the new spec, with the exception of the above 2 items. -- Rod Taylor <rbt@rbt.ca> PGP Key: http://www.rbt.ca/rbtpub.asc
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