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Doc: Improve clarity on partitioned table limitations

author David Rowley <drowley@postgresql.org>

2020年9月30日 00:02:08 +0000 (13:02 +1300)

committer David Rowley <drowley@postgresql.org>

2020年9月30日 00:02:08 +0000 (13:02 +1300)

Explicitly mention that primary key constraints are also included in the
limitation that the constraint columns must be a superset of the partition key
columns.

Wording suggestion from Tom Lane.

Discussion: https://postgr.es/m/64062533.78364.1601415362244@mail.yahoo.com
Backpatch-through: 11, where unique constraints on partitioned tables were added

doc/src/sgml/ddl.sgml patch | blob | blame | history

diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml

index e890bdd10ad7291f92ac4a4a564c3891e8814cad..9fb2be6674f9543a30de74c635c2dada9cba3105 100644 (file)

--- a/doc/src/sgml/ddl.sgml

+++ b/doc/src/sgml/ddl.sgml

@@ -4056,8 +4056,8 @@ ALTER INDEX measurement_city_id_logdate_key

<para>

- Unique constraints on partitioned tables must include all the

- partition key columns. This limitation exists because

+ Unique constraints (and hence primary keys) on partitioned tables must

+ include all the partition key columns. This limitation exists because

<productname>PostgreSQL</productname> can only enforce

uniqueness in each partition individually.

</para>

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