'\" t
.\"     Title: ALTER TRIGGER
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 2021
.\"    Manual: PostgreSQL 11.12 Documentation
.\"    Source: PostgreSQL 11.12
.\"  Language: English
.\"
.TH "ALTER TRIGGER" "7" "2021" "PostgreSQL 11.12" "PostgreSQL 11.12 Documentation"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
ALTER_TRIGGER \- change the definition of a trigger
.SH "SYNOPSIS"
.sp
.nf
ALTER TRIGGER \fIname\fR ON \fItable_name\fR RENAME TO \fInew_name\fR
ALTER TRIGGER \fIname\fR ON \fItable_name\fR DEPENDS ON EXTENSION \fIextension_name\fR
.fi
.SH "DESCRIPTION"
.PP
\fBALTER TRIGGER\fR
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\&.
.PP
You must own the table on which the trigger acts to be allowed to change its properties\&.
.SH "PARAMETERS"
.PP
\fIname\fR
.RS 4
The name of an existing trigger to alter\&.
.RE
.PP
\fItable_name\fR
.RS 4
The name of the table on which this trigger acts\&.
.RE
.PP
\fInew_name\fR
.RS 4
The new name for the trigger\&.
.RE
.PP
\fIextension_name\fR
.RS 4
The name of the extension that the trigger is to depend on\&.
.RE
.SH "NOTES"
.PP
The ability to temporarily enable or disable a trigger is provided by
ALTER TABLE (\fBALTER_TABLE\fR(7)), not by
\fBALTER TRIGGER\fR, because
\fBALTER TRIGGER\fR
has no convenient way to express the option of enabling or disabling all of a table\*(Aqs triggers at once\&.
.SH "EXAMPLES"
.PP
To rename an existing trigger:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER TRIGGER emp_stamp ON emp RENAME TO emp_track_chgs;
.fi
.if n \{\
.RE
.\}
.PP
To mark a trigger as being dependent on an extension:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER TRIGGER emp_stamp ON emp DEPENDS ON EXTENSION emplib;
.fi
.if n \{\
.RE
.\}
.SH "COMPATIBILITY"
.PP
\fBALTER TRIGGER\fR
is a
PostgreSQL
extension of the SQL standard\&.
.SH "SEE ALSO"
ALTER TABLE (\fBALTER_TABLE\fR(7))