At risk of putting my foot in my mouth again, greatest() returns null if one
or more expressions are null for Oracle enterprise 9.2.0.7 and 10.2.0.3.
The docs for greatest() don't talk of NULL:
SQL> select greatest(1,2,null,3) from dual;
GREATEST(1,2,NULL,3)
--------------------
SQL> select greatest(1,2,3) from dual;
GREATEST(1,2,3)
---------------
3
SQL> select version from v$instance;
VERSION
---------------------------------------------------
9.2.0.7.0
SQL> select greatest(1,2,null,3) from dual;
GREATEST(1,2,NULL,3)
--------------------
SQL> select greatest(1,2,3) from dual;
GREATEST(1,2,3)
---------------
3
SQL> select version from v$instance;
VERSION
---------------------------------------------------
10.2.0.3.0
> -----Original Message-----
> From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-
> owner@postgresql.org] On Behalf Of Pavel Stehule
> Sent: Saturday, June 30, 2007 10:37 AM
> To: Bruno Wolff III; Pavel Stehule; pgsql-general@postgresql.org
> Subject: Re: [GENERAL] greatest/least semantics different between oracle
> and postgres
>
> > Maybe that reference was for an earlier version of Oracle and the
> definition
> > changed at some point? I only have access to version 9 and greatest and
> > lest are strict there.
> >
>
> I am installing OracleXE and I'll test it.
>
> Pavel
>
> ---------------------------(end of broadcast)---------------------------
> TIP 3: Have you checked our extensive FAQ?
>
> http://www.postgresql.org/docs/faq
