'\" t
.\"     Title: DROP AGGREGATE
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 2019
.\"    Manual: PostgreSQL 9.6.12 Documentation
.\"    Source: PostgreSQL 9.6.12
.\"  Language: English
.\"
.TH "DROP AGGREGATE" "7" "2019" "PostgreSQL 9.6.12" "PostgreSQL 9.6.12 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, \(lqDependency Tracking\(rq, in the documentation)\&.
.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
.\}
.sp
.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))