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Clarify documentation about "peer" rows in window functions

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Peer rows are matching rows when ORDER BY is specified.

Report by arnaud.mouronval@gmail.com, David G Johnston
This commit is contained in:
Bruce Momjian
2014-09-05 18:59:41 -04:00
parent a9c22d1480
commit 1f4d1074c5
3 changed files with 8 additions and 6 deletions
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4
doc/src/sgml/syntax.sgml
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@ -1877,7 +1877,7 @@ UNBOUNDED FOLLOWING
first <firstterm>peer</> row (a row that <literal>ORDER BY</> considers
equivalent to the current row), while a <replaceable>frame_end</> of
<literal>CURRENT ROW</> means the frame ends with the last equivalent
peer. In <literal>ROWS</> mode, <literal>CURRENT ROW</> simply means
<literal>ORDER BY</> peer. In <literal>ROWS</> mode, <literal>CURRENT ROW</> simply means
the current row.
</para>
@ -1897,7 +1897,7 @@ UNBOUNDED FOLLOWING
which is the same as <literal>RANGE BETWEEN UNBOUNDED PRECEDING AND
CURRENT ROW</>. With <literal>ORDER BY</>, this sets the frame to be
all rows from the partition start up through the current row's last
peer. Without <literal>ORDER BY</>, all rows of the partition are
<literal>ORDER BY</> peer. Without <literal>ORDER BY</>, all rows of the partition are
included in the window frame, since all rows become peers of the current
row.
</para>