doc: clarify CREATE TABLE AS ... IF NOT EXISTS

Bruce Momjian <bruce@momjian.us>

Commit: ff48a0c80ec8dc47ba59161b43058ddcdfbe5b09
Author: Bruce Momjian <bruce@momjian.us>
Date: 2022-08-12T14:59:00Z
Releases: 14.6
doc:  clarify CREATE TABLE AS ... IF NOT EXISTS

Mention that the table is not modified if it already exists.

Reported-by: frank_limpert@yahoo.com

Discussion: https://postgr.es/m/164441177106.9677.5991676148704507229@wrigleys.postgresql.org

Backpatch-through: 10

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doc/src/sgml/ref/create_table_as.sgml modified +2 −3

Documentation touched