From: Bruce Momjian <bruce@momjian.us>
Date: Wed, 15 Aug 2012 20:03:58 +0000 (-0400)
Subject: Document why you can't use date_trunc("week") on intervals.
X-Git-Tag: REL9_3_BETA1~1089
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=74f4881d7cc9c69cb0e0b236f06d1ebf9859a737;p=postgresql

Document why you can't use date_trunc("week") on intervals.
---

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index d5ad4718b1..5d0c71a8b9 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>