From f72aad5678b5d9bf570a51a9899b4e950ce9f828 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Mon, 21 Feb 2000 01:20:41 +0000
Subject: [PATCH] Update discussion of aggregate syntax to mention ALL.
---
doc/src/sgml/syntax.sgml | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/doc/src/sgml/syntax.sgml b/doc/src/sgml/syntax.sgml
index 08f7955df93..332464429cd 100644
--- a/doc/src/sgml/syntax.sgml
+++ b/doc/src/sgml/syntax.sgml
@@ -711,6 +711,7 @@ sqrt(emp.salary)
<simplelist>
<member><replaceable>aggregate_name</replaceable> (<replaceable>expression</replaceable>)</member>
+ <member><replaceable>aggregate_name</replaceable> (ALL <replaceable>expression</replaceable>)</member>
<member><replaceable>aggregate_name</replaceable> (DISTINCT <replaceable>expression</replaceable>)</member>
<member><replaceable>aggregate_name</replaceable> ( * )</member>
</simplelist>
@@ -723,7 +724,8 @@ sqrt(emp.salary)
<para>
The first form of aggregate expression invokes the aggregate across all
input rows for which the given expression yields a non-null value.
- The second form invokes the aggregate for all distinct non-null values
+ The second form is the same as the first, since ALL is the default.
+ The third form invokes the aggregate for all distinct non-null values
of the expression found in the input rows. The last form invokes the
aggregate once for each input row regardless of null or non-null values;
since no particular input value is specified, it is generally only useful
--
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