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doc: add examples of creative use of unique expression indexes
authorBruce Momjian <bruce@momjian.us>
Fri, 27 Dec 2019 19:49:08 +0000 (14:49 -0500)
committerBruce Momjian <bruce@momjian.us>
Fri, 27 Dec 2019 19:49:08 +0000 (14:49 -0500)
commit937cf1b09146ef91195780f747900cf69e8d0fd8
treeff25b64be70347db261c70e141f03c3e880f3654tree
parentebd3c132f5304f351e43e34a4565233e2587154fcommit | diff
doc:  add examples of creative use of unique expression indexes

Unique expression indexes can constrain data in creative ways, so show
two examples.

Reported-by: Tuomas Leikola
Discussion: https://postgr.es/m/156760275564.1127.12321702656456074572@wrigleys.postgresql.org

Backpatch-through: 9.4
doc/src/sgml/indices.sgml diff | blob | blame | history
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