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Add a note pointing out that some other databases make GREATEST and

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LEAST handle NULL arguments differently than we do.  Per a discussion
on 30-Jun that somehow didn't get done.
This commit is contained in:
Tom Lane 2007-10-30 19:06:56 +00:00
parent b973530737
commit 897313e824
1 changed files with 4 additions and 2 deletions
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6
doc/src/sgml/func.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.405 2007/10/25 18:54:03 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.406 2007/10/30 19:06:56 tgl Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
@ -9016,7 +9016,9 @@ SELECT NULLIF(value, '(none)') ...
<para>
Note that <function>GREATEST</> and <function>LEAST</> are not in
the SQL standard, but are a common extension.
the SQL standard, but are a common extension. Some other databases
make them return NULL if any argument is NULL, rather than only when
all are NULL.
</para>
</sect2>
</sect1>