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

2012-08-15 16:03:58 -04:00 · 2012-08-15 16:03:58 -04:00 · 74f4881d7c
parent 1d9a6ae855
commit 74f4881d7c
1 changed files with 5 additions and 0 deletions
--- 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>