doc: show how interval's 3 unit buckets behave using EXTRACT()

Bruce Momjian <bruce@momjian.us>

Commit: b6e94b820a21146b898232bc3e3920b31198e637
Author: Bruce Momjian <bruce@momjian.us>
Date: 2018-06-24T03:32:42Z
Releases: 11.0
doc:  show how interval's 3 unit buckets behave using EXTRACT()

This clarifies when justify_days() and justify_hours() are useful.
Paragraph moved too.

Reported-by: vodevsh@gmail.com

Discussion: https://postgr.es/m/152698651482.26744.15456677499485530703@wrigleys.postgresql.org

Backpatch-through: 9.3

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doc/src/sgml/datatype.sgml modified +27 −13

Documentation touched