CLASS="LITERAL"
>partition</TT
> is the default setting.
        It is often used with inheritance and partitioned tables to
        improve performance.
      </P
><P
>        When this parameter allows it for a particular table, the planner
        compares query conditions with the table's <TT
CLASS="LITERAL"
>CHECK</TT
>
        constraints, and omits scanning tables for which the conditions
        contradict the constraints.  For example:

</P><PRE
CLASS="PROGRAMLISTING"
>CREATE TABLE parent(key integ