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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)
commit2034bcc845f228c675c218e1928cf5337e74381d
tree06b397c16ae2667cb86b9e684cbea690bb80e50ctree
parent5d72f85d4ca8e0a56836ea48576ff8f684f7dce7commit | 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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