'\" t
.\"     Title: ALTER GROUP
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
.\"      Date: 2016
.\"    Manual: PostgreSQL 9.5.2 Documentation
.\"    Source: PostgreSQL 9.5.2
.\"  Language: English
.\"
.TH "ALTER GROUP" "5sql" "2016" "PostgreSQL 9.5.2" "PostgreSQL 9.5.2 Documentation"
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.SH "NAME"
ALTER_GROUP \- change role name or membership
.SH "SYNOPSIS"
.sp
.nf
ALTER GROUP \fIrole_specification\fR ADD USER \fIuser_name\fR [, \&.\&.\&. ]
ALTER GROUP \fIrole_specification\fR DROP USER \fIuser_name\fR [, \&.\&.\&. ]

where \fIrole_specification\fR can be:

    \fIrole_name\fR
  | CURRENT_USER
  | SESSION_USER

ALTER GROUP \fIgroup_name\fR RENAME TO \fInew_name\fR
.fi
.SH "DESCRIPTION"
.PP

\fBALTER GROUP\fR
changes the attributes of a user group\&. This is an obsolete command, though still accepted for backwards compatibility, because groups (and users too) have been superseded by the more general concept of roles\&.
.PP
The first two variants add users to a group or remove them from a group\&. (Any role can play the part of either a
\(lquser\(rq
or a
\(lqgroup\(rq
for this purpose\&.) These variants are effectively equivalent to granting or revoking membership in the role named as the
\(lqgroup\(rq; so the preferred way to do this is to use
\fBGRANT\fR(5)
or
\fBREVOKE\fR(5)\&.
.PP
The third variant changes the name of the group\&. This is exactly equivalent to renaming the role with
ALTER ROLE (\fBALTER_ROLE\fR(5))\&.
.SH "PARAMETERS"
.PP
\fIgroup_name\fR
.RS 4
The name of the group (role) to modify\&.
.RE
.PP
\fIuser_name\fR
.RS 4
Users (roles) that are to be added to or removed from the group\&. The users must already exist;
\fBALTER GROUP\fR
does not create or drop users\&.
.RE
.PP
\fInew_name\fR
.RS 4
The new name of the group\&.
.RE
.SH "EXAMPLES"
.PP
Add users to a group:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER GROUP staff ADD USER karl, john;
.fi
.if n \{\
.RE
.\}
.sp
Remove a user from a group:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER GROUP workers DROP USER beth;
.fi
.if n \{\
.RE
.\}
.SH "COMPATIBILITY"
.PP
There is no
\fBALTER GROUP\fR
statement in the SQL standard\&.
.SH "SEE ALSO"
\fBGRANT\fR(5), \fBREVOKE\fR(5), ALTER ROLE (\fBALTER_ROLE\fR(5))