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'\" t .\" Title: DROP FUNCTION .\" Author: The PostgreSQL Global Development Group .\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/> .\" Date: 2017-11-06 .\" Manual: PostgreSQL 9.2.24 Documentation .\" Source: PostgreSQL 9.2.24 .\" Language: English .\" .TH "DROP FUNCTION" "7" "2017-11-06" "PostgreSQL 9.2.24" "PostgreSQL 9.2.24 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" DROP_FUNCTION \- remove a function .\" DROP FUNCTION .SH "SYNOPSIS" .sp .nf DROP FUNCTION [ IF EXISTS ] \fIname\fR ( [ [ \fIargmode\fR ] [ \fIargname\fR ] \fIargtype\fR [, \&.\&.\&.] ] ) [ CASCADE | RESTRICT ] .fi .SH "DESCRIPTION" .PP \fBDROP FUNCTION\fR removes the definition of an existing function\&. To execute this command the user must be the owner of the function\&. The argument types to the function must be specified, since several different functions can exist with the same name and different argument lists\&. .SH "PARAMETERS" .PP IF EXISTS .RS 4 Do not throw an error if the function does not exist\&. A notice is issued in this case\&. .RE .PP \fIname\fR .RS 4 The name (optionally schema\-qualified) of an existing function\&. .RE .PP \fIargmode\fR .RS 4 The mode of an argument: IN, OUT, INOUT, or VARIADIC\&. If omitted, the default is IN\&. Note that \fBDROP FUNCTION\fR does not actually pay any attention to OUT arguments, since only the input arguments are needed to determine the function\*(Aqs identity\&. So it is sufficient to list the IN, INOUT, and VARIADIC arguments\&. .RE .PP \fIargname\fR .RS 4 The name of an argument\&. Note that \fBDROP FUNCTION\fR does not actually pay any attention to argument names, since only the argument data types are needed to determine the function\*(Aqs identity\&. .RE .PP \fIargtype\fR .RS 4 The data type(s) of the function\*(Aqs arguments (optionally schema\-qualified), if any\&. .RE .PP CASCADE .RS 4 Automatically drop objects that depend on the function (such as operators or triggers)\&. .RE .PP RESTRICT .RS 4 Refuse to drop the function if any objects depend on it\&. This is the default\&. .RE .SH "EXAMPLES" .PP This command removes the square root function: .sp .if n \{\ .RS 4 .\} .nf DROP FUNCTION sqrt(integer); .fi .if n \{\ .RE .\} .SH "COMPATIBILITY" .PP A \fBDROP FUNCTION\fR statement is defined in the SQL standard, but it is not compatible with this command\&. .SH "SEE ALSO" CREATE FUNCTION (\fBCREATE_FUNCTION\fR(7)), ALTER FUNCTION (\fBALTER_FUNCTION\fR(7))