Add some minimal documentation that the SQL standard requires parentheses

after ONLY.

diff --git a/doc/src/sgml/ref/select.sgml b/doc/src/sgml/ref/select.sgml
index 0a19f894e7024b6cc86a0f13902c9afb4adb819d..ba14437764f9cb07b2051ab6c674163d159f4136 100644 (file)
--- a/doc/src/sgml/ref/select.sgml
+++ b/doc/src/sgml/ref/select.sgml
@@ -1,5 +1,5 @@
 
 
@@ -1457,6 +1457,19 @@ SELECT distributors.* WHERE distributors.name = 'Westward';
    
   
 
+  
+   <literal>ONLY</literal> and Parentheses
+
+   
+    The SQL standard requires parentheses around the table name
+    after ONLY, as in SELECT * FROM ONLY
+    (tab1), ONLY (tab2) WHERE ....  PostgreSQL supports that
+    as well, but the parentheses are optional.  (This point applies
+    equally to all SQL commands supporting the ONLY
+    option.)
+   
+  
+
   
    Namespace Available to <literal>GROUP BY</literal> and <literal>ORDER BY</literal>