Hello,
I tried "select greatest(max(a), max(b)) from public.test", but I got
the following errors:
ERROR: function greatest(integer, integer) does not exist
HINT: No function matches the given name and argument types. You may
need to add explicit type casts.
May I know where I can read the docs about greatest & least please.
I am using PostgreSQL 8.0.7.
Thanks,
Ying
Amos Hayes <[EMAIL PROTECTED]> writes:
I'm trying to build a query that among other things, returns the
minimum and maximum values contained in either of two columns.
I think you might be looking for
select greatest(max(columnA), max(columnB)) from tab;
select least(min(columnA), min(columnB)) from tab;
greatest/least are relatively new but you can roll your own in
older PG releases.
regards, tom lane
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
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