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

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The point is that DELETE triggers cannot modify any values.

Reported-by: Eugen Konkov

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

Backpatch-through: 9.4
pull/161/head
Bruce Momjian 6 years ago
parent c8cb98ec41
commit c10fae2142
1 changed files with 1 additions and 1 deletions
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      doc/src/sgml/trigger.sgml

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doc/src/sgml/trigger.sgml
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@ -230,7 +230,7 @@
used to signal that the trigger performed the necessary data used to signal that the trigger performed the necessary data
modifications in the view. This will cause the count of the number modifications in the view. This will cause the count of the number
of rows affected by the command to be incremented. For 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 may modify the <varname>NEW</varname> row before returning it. This will
change the data returned by change the data returned by
<command>INSERT RETURNING</command> or <command>UPDATE RETURNING</command>, <command>INSERT RETURNING</command> or <command>UPDATE RETURNING</command>,

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