Document use of partial indexes for partial unique constraints

Report by Tomáš Greif Backpatch through 9.4
11 years ago · 4b22401175
parent 4011f8c98b
commit 4b22401175
1 changed files with 3 additions and 1 deletions
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@ -547,6 +547,8 @@ 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. 
+    A uniqueness constraint on only some rows can be enforced by creating
+    a <link linkend="indexes-partial">partial index</link>.
   </para>

   <indexterm>