> Merlin Moncure wrote:
> > I need a fast way (sql only preferred) to solve the following
> > I need the smallest integer that is greater than zero that is not in
> > column of a table.
> >
> > I've already worked out a query using generate_series (not scalable)
> > pl/pgsql.  An SQL only solution would be preferred, am I missing
> > something obvious?
> Probably not, but I thought about this "brute-force" approach... :-)
> This should work well provided that:
> - you have a finite number of integers. Your column should have a
>    integer value with a reasonable maximum like 100,000 or 1,000,000.
>    #define YOUR_MAX 99999
:-) generate_series function does the same thing only a little bit
faster (although less portable).

generate_series(m,n) returns set of integers from m to n with time
complexity n - m.  I use it for cases where I need to increment for
something, for example:

select now()::date + d from generate_series(0,355) as d;

returns days from today until 355 days from now.


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