In response to Jay :
> Thanks!
> But, since the master can contain many users (user2, user3, and so on)
> I suppose this won't be a proper solution?
> Sorry if I was a bit unclear in my description.
>
> I.e., the master is of the form:
>
> user_id date
> User1 20010101
> User1 20000101
> User1 19990101
> User1 19970101
> User2 ...
> ...
That's not the problem ...
>
> Btw, I'm using Postgre version 8.2 and I cannot use subqueries do the
but this.
lag() over () and similar windowing functions new since 8.4.
Andreas
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Andreas Kretschmer
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