From 74f4881d7cc9c69cb0e0b236f06d1ebf9859a737 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Wed, 15 Aug 2012 16:03:58 -0400
Subject: [PATCH] Document why you can't use date_trunc("week") on intervals.
---
doc/src/sgml/func.sgml | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index d5ad4718b15..5d0c71a8b9f 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -7050,6 +7050,11 @@ date_trunc('<replaceable>field</replaceable>', <replaceable>source</replaceable>
</simplelist>
</para>
+ <para>
+ <literal>week</literal> is not supported for <type>interval</>
+ values because months usually have fractional weeks.
+ </para>
+
<para>
Examples:
<screen>
--
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