Обсуждение: Re: Inserting and incrementing with MAX aggregate

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Re: Inserting and incrementing with MAX aggregate

От
Ian Harding
Дата:
Could you not:

insert into events (eid,name) values ((SELECT max(eid) FROM
EVENTS)+1,'server down');

It looks like it would work.  It's just a subquery...

Ian

Keith Perry wrote:

> I was wondering if this statement was still supported in 7.0.x versions
> of pgSQL.  I upgraded from a 6.x version where say:
>
> insert into events (eid,name) values (max(eid)+1,'server down');
>
> works but not in the 7.x variants.
>
> I know that I could use the serial type for that column but in the
> interest not having to rewrite the code (or dump, drop and recreate the
> tables/data), I wanted  to know if there was a more stand way to
> incrementing a field automatically that would be fairly portable.  Any
> help would be appreciated.
>
> Keith Perry
> VCSN Inc.
> keith@vcsn.com
> http://vcsn.com


Re: Inserting and incrementing with MAX aggregate

От
Keith Perry
Дата:
Ahhh, thank you that worked.  I don't know why but for some reason I didn't
think I could do a subquery in an insert *laff*- 'learn something new
everyday :)

Keith-

Ian Harding wrote:

> Could you not:
>
> insert into events (eid,name) values ((SELECT max(eid) FROM
> EVENTS)+1,'server down');
>
> It looks like it would work.  It's just a subquery...
>
> Ian
>
> Keith Perry wrote:
>
> > I was wondering if this statement was still supported in 7.0.x versions
> > of pgSQL.  I upgraded from a 6.x version where say:
> >
> > insert into events (eid,name) values (max(eid)+1,'server down');
> >
> > works but not in the 7.x variants.
> >
> > I know that I could use the serial type for that column but in the
> > interest not having to rewrite the code (or dump, drop and recreate the
> > tables/data), I wanted  to know if there was a more stand way to
> > incrementing a field automatically that would be fairly portable.  Any
> > help would be appreciated.
> >
> > Keith Perry
> > VCSN Inc.
> > keith@vcsn.com
> > http://vcsn.com