'\" t
.\"     Title: DROP AGGREGATE
.\"    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 "DROP AGGREGATE" "7" "2021" "PostgreSQL 11.12" "PostgreSQL 11.12 Documentation"
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.SH "NAME"
DROP_AGGREGATE \- remove an aggregate function
.SH "SYNOPSIS"
.sp
.nf
DROP AGGREGATE [ IF EXISTS ] \fIname\fR ( \fIaggregate_signature\fR ) [, \&.\&.\&.] [ CASCADE | RESTRICT ]

where \fIaggregate_signature\fR is:

* |
[ \fIargmode\fR ] [ \fIargname\fR ] \fIargtype\fR [ , \&.\&.\&. ] |
[ [ \fIargmode\fR ] [ \fIargname\fR ] \fIargtype\fR [ , \&.\&.\&. ] ] ORDER BY [ \fIargmode\fR ] [ \fIargname\fR ] \fIargtype\fR [ , \&.\&.\&. ]
.fi
.SH "DESCRIPTION"
.PP
\fBDROP AGGREGATE\fR
removes an existing aggregate function\&. To execute this command the current user must be the owner of the aggregate function\&.
.SH "PARAMETERS"
.PP
IF EXISTS
.RS 4
Do not throw an error if the aggregate does not exist\&. A notice is issued in this case\&.
.RE
.PP
\fIname\fR
.RS 4
The name (optionally schema\-qualified) of an existing aggregate function\&.
.RE
.PP
\fIargmode\fR
.RS 4
The mode of an argument:
IN
or
VARIADIC\&. If omitted, the default is
IN\&.
.RE
.PP
\fIargname\fR
.RS 4
The name of an argument\&. Note that
\fBDROP AGGREGATE\fR
does not actually pay any attention to argument names, since only the argument data types are needed to determine the aggregate function\*(Aqs identity\&.
.RE
.PP
\fIargtype\fR
.RS 4
An input data type on which the aggregate function operates\&. To reference a zero\-argument aggregate function, write
*
in place of the list of argument specifications\&. To reference an ordered\-set aggregate function, write
ORDER BY
between the direct and aggregated argument specifications\&.
.RE
.PP
CASCADE
.RS 4
Automatically drop objects that depend on the aggregate function (such as views using it), and in turn all objects that depend on those objects (see
Section\ \&5.13)\&.
.RE
.PP
RESTRICT
.RS 4
Refuse to drop the aggregate function if any objects depend on it\&. This is the default\&.
.RE
.SH "NOTES"
.PP
Alternative syntaxes for referencing ordered\-set aggregates are described under
ALTER AGGREGATE (\fBALTER_AGGREGATE\fR(7))\&.
.SH "EXAMPLES"
.PP
To remove the aggregate function
myavg
for type
integer:
.sp
.if n \{\
.RS 4
.\}
.nf
DROP AGGREGATE myavg(integer);
.fi
.if n \{\
.RE
.\}
.PP
To remove the hypothetical\-set aggregate function
myrank, which takes an arbitrary list of ordering columns and a matching list of direct arguments:
.sp
.if n \{\
.RS 4
.\}
.nf
DROP AGGREGATE myrank(VARIADIC "any" ORDER BY VARIADIC "any");
.fi
.if n \{\
.RE
.\}
.PP
To remove multiple aggregate functions in one command:
.sp
.if n \{\
.RS 4
.\}
.nf
DROP AGGREGATE myavg(integer), myavg(bigint);
.fi
.if n \{\
.RE
.\}
.SH "COMPATIBILITY"
.PP
There is no
\fBDROP AGGREGATE\fR
statement in the SQL standard\&.
.SH "SEE ALSO"
ALTER AGGREGATE (\fBALTER_AGGREGATE\fR(7)), CREATE AGGREGATE (\fBCREATE_AGGREGATE\fR(7))