diff options
Diffstat (limited to 'doc/src/sgml/man7/DROP_FUNCTION.7')
| -rw-r--r-- | doc/src/sgml/man7/DROP_FUNCTION.7 | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/doc/src/sgml/man7/DROP_FUNCTION.7 b/doc/src/sgml/man7/DROP_FUNCTION.7 new file mode 100644 index 0000000..f026467 --- /dev/null +++ b/doc/src/sgml/man7/DROP_FUNCTION.7 @@ -0,0 +1,186 @@ +'\" t +.\" Title: DROP FUNCTION +.\" Author: The PostgreSQL Global Development Group +.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/> +.\" Date: 2023 +.\" Manual: PostgreSQL 15.5 Documentation +.\" Source: PostgreSQL 15.5 +.\" Language: English +.\" +.TH "DROP FUNCTION" "7" "2023" "PostgreSQL 15.5" "PostgreSQL 15.5 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 +.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\&. If no argument list is specified, the name must be unique in its schema\&. +.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), and in turn all objects that depend on those objects (see +Section\ \&5.14)\&. +.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 +.\} +.PP +Drop multiple functions in one command: +.sp +.if n \{\ +.RS 4 +.\} +.nf +DROP FUNCTION sqrt(integer), sqrt(bigint); +.fi +.if n \{\ +.RE +.\} +.PP +If the function name is unique in its schema, it can be referred to without an argument list: +.sp +.if n \{\ +.RS 4 +.\} +.nf +DROP FUNCTION update_employee_salaries; +.fi +.if n \{\ +.RE +.\} +.sp +Note that this is different from +.sp +.if n \{\ +.RS 4 +.\} +.nf +DROP FUNCTION update_employee_salaries(); +.fi +.if n \{\ +.RE +.\} +.sp +which refers to a function with zero arguments, whereas the first variant can refer to a function with any number of arguments, including zero, as long as the name is unique\&. +.SH "COMPATIBILITY" +.PP +This command conforms to the SQL standard, with these +PostgreSQL +extensions: +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +The standard only allows one function to be dropped per command\&. +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +The +IF EXISTS +option +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +The ability to specify argument modes and names +.RE +.SH "SEE ALSO" +CREATE FUNCTION (\fBCREATE_FUNCTION\fR(7)), ALTER FUNCTION (\fBALTER_FUNCTION\fR(7)), DROP PROCEDURE (\fBDROP_PROCEDURE\fR(7)), DROP ROUTINE (\fBDROP_ROUTINE\fR(7)) |