From: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: Wed, 10 Jul 2019 12:58:41 +0000 (-0400)
Subject: Mention limitation of unique in partitioned tables
X-Git-Tag: REL_11_5~49
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5918b82614513e1262c6c3ed286e4e1212a01bc3;p=postgresql

Mention limitation of unique in partitioned tables

Per gripe from Phil Bayer.

Authors: Amit Langote and others
Discussion: https://postgr.es/m/156236160709.1192.4498528196556144085@wrigleys.postgresql.org
---

diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index a49a14cac1..764d24a2d7 100644
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -3386,6 +3386,15 @@ ALTER INDEX measurement_city_id_logdate_key
       </para>
      </listitem>
 
+     <listitem>
+      <para>
+       Unique constraints on partitioned tables must include all the
+       partition key columns.  This limitation exists because
+       <productname>PostgreSQL</productname> can only enforce
+       uniqueness in each partition individually.
+      </para>
+     </listitem>
+
      <listitem>
       <para>
        While primary keys are supported on partitioned tables, foreign