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

74f4881d · Bruce Momjian · 1d9a6ae8 · 74f4881d
Commit 74f4881d authored Aug 15, 2012 by Bruce Momjian
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doc/src/sgml/func.sgml doc/src/sgml/func.sgml +5 -0

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--- 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>