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Document use of partial indexes for partial unique constraints

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Report by Tomáš Greif

Backpatch through 9.4
This commit is contained in:
Bruce Momjian 2014-09-03 14:32:57 -04:00
parent 4011f8c98b
commit 4b22401175
1 changed files with 3 additions and 1 deletions
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doc/src/sgml/ddl.sgml
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@ -547,6 +547,8 @@ CREATE TABLE products (
<para> <para>
Adding a unique constraint will automatically create a unique btree 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> </para>
<indexterm> <indexterm>