On Wed, Apr 30, 2014 at 10:18:22AM -0400, Robert Haas wrote:
> On Wed, Apr 9, 2014 at 8:17 AM, Tomáš Greif
> <[email protected]> wrote:
> > would it be good idea to add new paragraph 5.3.7 to chapter 5.3
> > (Constraints) with at least information that there is something like partial
> > unique index and link to chapter 11.8 (Partial Indexes)?
> >
> > Partial index can be used to enforce uniqueness in a way other constraints
> > cannot provide. Currently, it not easy to find this type of constraint as
> > not a lot of people would read through documentation on indexes when looking
> > for constraints.
>
> I think adding something to that chapter would be good.
Attached patch applied, and backpatched to 9.4.
--
Bruce Momjian <[email protected]> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ Everyone has their own god. +
diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
new file mode 100644
index 0fcd9f8..c07f5a2
*** a/doc/src/sgml/ddl.sgml
--- b/doc/src/sgml/ddl.sgml
*************** CREATE TABLE products (
*** 546,552 ****
<para>
Adding a unique constraint will automatically create a unique btree
! index on the column or group of columns used in the constraint.
</para>
<indexterm>
--- 546,554 ----
<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>
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