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In docs, clarify that, without ORDER BY, the window frame is all rows in

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the partition.
This commit is contained in:
Bruce Momjian 2012-08-16 11:32:22 -04:00
parent 5c1b2f5daa
commit c6ce4c1322
1 changed files with 4 additions and 3 deletions
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doc/src/sgml/syntax.sgml
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@ -1794,9 +1794,10 @@ UNBOUNDED FOLLOWING
window functions that act on the frame instead of the whole partition. window functions that act on the frame instead of the whole partition.
The default framing option is <literal>RANGE UNBOUNDED PRECEDING</>, The default framing option is <literal>RANGE UNBOUNDED PRECEDING</>,
which is the same as <literal>RANGE BETWEEN UNBOUNDED PRECEDING AND 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 CURRENT ROW</>. With <literal>ORDER BY</>, this sets the frame to
up through the current row's last peer as specified by <literal>ORDER BY</>, be all rows from partition start up through the current row's
or all partition rows if there is no <literal>ORDER BY</>. last peer. Without <literal>ORDER BY</>, all partition rows are
included in the window frame.
</para> </para>
<para> <para>