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docs: clarify that only INSERT and UPDATE triggers can mod. NEW 

The point is that DELETE triggers cannot modify any values.

Reported-by: Eugen Konkov, Liudmila Mantrova

Discussion: https://postgr.es/m/919823407.20191029175436@yandex.ru

Backpatch-through: 12 only, where commit as missing
This commit is contained in:
Bruce Momjian 2019-11-12 22:04:31 -05:00
parent 578a551f82
commit 5f2cfe7f5f
1 changed files with 1 additions and 1 deletions
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2
doc/src/sgml/trigger.sgml
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@ -230,7 +230,7 @@
used to signal that the trigger performed the necessary data
modifications in the view. This will cause the count of the number
of rows affected by the command to be incremented. For
<command>INSERT</command> and <command>UPDATE</command> operations, the trigger
<command>INSERT</command> and <command>UPDATE</command> operations only, the trigger
may modify the <varname>NEW</varname> row before returning it. This will
change the data returned by
<command>INSERT RETURNING</command> or <command>UPDATE RETURNING</command>,