Re: MAX(xmin)

I suspect you are missing the GROUP BY part of aggregate SELECT
statements. (MAX is an aggregate function like SUM)

e.g. SELECT MAX(xmin) from userstable GROUP BY whatever


"zammon@libero.it" wrote:
>
> Hi all,
>
> I'm trying to use the xmin column to use it as a versioning row to check
> if the row was modified by
> other users while I edit it.
> I need to select max(xmin) of a group of rows  but pg  get me an error.
> Someone can give me some tips  how to create a funcion  MAX(xmin)?
> Thank you
> Jose
>
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> TIP 4: Don't 'kill -9' the postmaster

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