Update discussion of aggregate syntax to mention ALL.

diff --git a/doc/src/sgml/syntax.sgml b/doc/src/sgml/syntax.sgml
index 08f7955df934ba9b1c583cb204c88c84165719b9..332464429cd79b3ba7d3eaf986deae491bb56b59 100644 (file)
--- a/doc/src/sgml/syntax.sgml
+++ b/doc/src/sgml/syntax.sgml
@@ -711,6 +711,7 @@ sqrt(emp.salary)
 
     
      aggregate_name (expression)
+     aggregate_name (ALL expression)
      aggregate_name (DISTINCT expression)
      aggregate_name ( * )
     
@@ -723,7 +724,8 @@ sqrt(emp.salary)
     
      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