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
------
REL_10_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/7dcec3ed45d5a128fcc8bce23b9a2879fc520aa0
Modified Files
--------------
doc/src/sgml/ddl.sgml | 28 ++++++++++++++++++++++++++--
1 file changed, 26 insertions(+), 2 deletions(-)