pgsql: Doc: add an example of a self-referential foreign key to ddl.sgm

Lists: pgsql-committers
From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Doc: add an example of a self-referential foreign key to ddl.sgm
Date: 2021-04-30 19:38:22
Message-ID: [email protected]
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Doc: add an example of a self-referential foreign key to ddl.sgml.

While we've always allowed such cases, the documentation didn't
say you could do it.

Discussion: https://postgr.es/m/[email protected]

Branch
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REL_13_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/3eeadc425ccf30d5738bb1204adb2e50a8bea8c1

Modified Files
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doc/src/sgml/ddl.sgml | 28 ++++++++++++++++++++++++++--
1 file changed, 26 insertions(+), 2 deletions(-)