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| author | Bruce Momjian <bruce@momjian.us> | 2014-09-03 14:34:46 -0400 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2014-09-03 14:34:46 -0400 |
| commit | 646deb603e0846d1efd4da84df412963dda68eec (patch) | |
| tree | d5581c0a6d7b5ea73ffdbbdeb607599f8f223dfc | |
| parent | 6ea591ed4619a29e57369fef905d2160bd6e5438 (diff) | |
Document use of partial indexes for partial unique constraints
Report by Tomáš Greif
Backpatch through 9.4
| -rw-r--r-- | doc/src/sgml/ddl.sgml | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml index 8ace8bd3a25..ceb83798c89 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> |