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pgsql: doc: add examples of creative use of unique expression indexes

From:	Bruce Momjian <bruce(at)momjian(dot)us>
To:	pgsql-committers(at)lists(dot)postgresql(dot)org
Subject:	pgsql: doc: add examples of creative use of unique expression indexes
Date:	2019-12-27 19:49:17
Message-ID:	E1ikvbp-0005je-GV@gemulon.postgresql.org
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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

Backpatch-through: 9.4

Branch
------
REL9_6_STABLE

Modified Files
--------------
doc/src/sgml/indices.sgml | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

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