ALTER TRIGGER
ALTER TRIGGER
ALTER TRIGGER - change the definition of a trigger
Synopsis
ALTER TRIGGERnameONtable_nameRENAME TOnew_nameALTER TRIGGERnameONtable_name[ NO ] DEPENDS ON EXTENSIONextension_name
Description
ALTER TRIGGER
changes properties of an existing
trigger. The
RENAME
clause changes the name of
the given trigger without otherwise changing the trigger
definition. The
DEPENDS ON EXTENSION
clause marks
the trigger as dependent on an extension, such that if the extension is
dropped, the trigger will automatically be dropped as well.
You must own the table on which the trigger acts to be allowed to change its properties.
Parameters
-
name -
The name of an existing trigger to alter.
-
table_name -
The name of the table on which this trigger acts.
-
new_name -
The new name for the trigger.
-
extension_name -
The name of the extension that the trigger is to depend on (or no longer dependent on, if
NOis specified). A trigger that's marked as dependent on an extension is automatically dropped when the extension is dropped.
Notes
The ability to temporarily enable or disable a trigger is provided by
ALTER TABLE
, not by
ALTER TRIGGER
, because
ALTER TRIGGER
has no
convenient way to express the option of enabling or disabling all of
a table's triggers at once.
Examples
To rename an existing trigger:
ALTER TRIGGER emp_stamp ON emp RENAME TO emp_track_chgs;
To mark a trigger as being dependent on an extension:
ALTER TRIGGER emp_stamp ON emp DEPENDS ON EXTENSION emplib;
Compatibility
ALTER TRIGGER
is a
PostgreSQL
extension of the SQL standard.