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Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/func.sgml | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml index b9ef827984d..a7dc05bf382 100644 --- a/doc/src/sgml/func.sgml +++ b/doc/src/sgml/func.sgml @@ -10745,6 +10745,14 @@ SELECT NULLIF(value, '(none)') ... </tbody> </tgroup> </table> + + <para> + The <function>lower</> and <function>upper</> functions return null + if the range is empty or the requested bound is infinite. + The <function>lower_inc</function>, <function>upper_inc</function>, + <function>lower_inf</function>, and <function>upper_inf</function> + functions all return false for an empty range. + </para> </sect1> <sect1 id="functions-aggregate"> |