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

author Tom Lane <tgl@sss.pgh.pa.us>

2021年4月30日 19:37:56 +0000 (15:37 -0400)

committer Tom Lane <tgl@sss.pgh.pa.us>

2021年4月30日 19:37:56 +0000 (15:37 -0400)

commit e6f9539dc32473793c03cbe95bc099ee0a199c73

tree eac9ecc578e08f4e57f7430be213dcfcf97eef2b tree

parent 386e64ea5abf346d887c21ea8869317838ba19b5 commit | diff

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/161969805833.690.13680986983883602407@wrigleys.postgresql.org

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