From: Bruce Momjian <bruce@momjian.us>
Date: Wed, 3 Sep 2014 18:32:57 +0000 (-0400)
Subject: Document use of partial indexes for partial unique constraints
X-Git-Tag: REL9_5_ALPHA1~1522
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4b224011751d1d4a300a0a179fc006658c6868a3;p=postgresql

Document use of partial indexes for partial unique constraints

Report by Tomáš Greif

Backpatch through 9.4
---

diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index 0fcd9f8706..c07f5a203d 100644
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -546,7 +546,9 @@ CREATE TABLE products (
 
    <para>
     Adding a unique constraint will automatically create a unique btree
-    index on the column or group of columns used in the constraint.
+    index on the column or group of columns used in the constraint. 
+    A uniqueness constraint on only some rows can be enforced by creating
+    a <link linkend="indexes-partial">partial index</link>.
    </para>
 
    <indexterm>