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 ed2d9c60d50f62bf88c1ce7d8904361ee0bd42b6..9301f0227d7b2c218f119339b6bbed772786d8f4 100644 (file)
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -4003,6 +4003,15 @@ ALTER INDEX measurement_city_id_logdate_key
       
      
 
+     
+      
+       Unique constraints on partitioned tables must include all the
+       partition key columns.  This limitation exists because
+       PostgreSQL can only enforce
+       uniqueness in each partition individually.
+      
+     
+
      
       
        BEFORE ROW triggers, if necessary, must be defined