window functions that act on the frame instead of the whole partition.

The default framing option is <literal>RANGE UNBOUNDED PRECEDING</>,

which is the same as <literal>RANGE BETWEEN UNBOUNDED PRECEDING AND

CURRENT ROW</>. This sets the frame to be all rows from the partition start

up through the current row's last peer as specified by <literal>ORDER BY</>,

or all partition rows if there is no <literal>ORDER BY</>.

CURRENT ROW</>. With <literal>ORDER BY</>, this sets the frame to

be all rows from partition start up through the current row's

last peer. Without <literal>ORDER BY</>, all partition rows are

included in the window frame.

</para>

<para>