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Bruce Momjian a9760d0f3c 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
2019-12-27 14:49:08 -05:00
..
src doc: add examples of creative use of unique expression indexes 2019-12-27 14:49:08 -05:00
KNOWN_BUGS
Makefile Remove maintainer-check target, fold into normal build 2013-10-10 20:11:56 -04:00
MISSING_FEATURES
TODO Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00