doc: add examples of creative use of unique expression indexes
Bruce Momjian <bruce@momjian.us>
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
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