doc: Improve description of referential actions

Peter Eisentraut <peter@eisentraut.org>

Commit: 1e08905842fbfa9301374f10571116bc5f0f7b8a
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2024-11-29T07:53:00Z
Releases: 18.0
doc: Improve description of referential actions

Some of the differences between NO ACTION and RESTRICT were not
explained fully.

Discussion: https://www.postgresql.org/message-id/ea5b2777-266a-46fa-852f-6fca6ec480ad@eisentraut.org

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doc/src/sgml/ddl.sgml modified +33 −8
doc/src/sgml/ref/create_table.sgml modified +11 −9

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