Doc: Improve clarity on partitioned table limitations

David Rowley <drowley@postgresql.org>

Commit: 5c7afb4a29aa0f75def751406b4004e7f047a7f3
Author: David Rowley <drowley@postgresql.org>
Date: 2020-09-30T00:04:13Z
Releases: 12.5
Doc: Improve clarity on partitioned table limitations

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

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doc/src/sgml/ddl.sgml modified +2 −2

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