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alter_group(7) [redhat man page]

ALTER 
GROUP(7) SQL Commands ALTER GROUP(7) NAME
ALTER GROUP - add users to a group or remove users from a group SYNOPSIS
ALTER GROUP name ADD USER username [, ... ] ALTER GROUP name DROP USER username [, ... ] INPUTS name The name of the group to modify. username Users which are to be added or removed from the group. The user names must exist. OUTPUTS ALTER GROUP Message returned if the alteration was successful. DESCRIPTION
ALTER GROUP is used to add or remove users from a group. Only database superusers can use this command. Adding a user to a group does not create the user. Similarly, removing a user from a group does not drop the user itself. Use CREATE GROUP [create_group(7)] to create a new group and DROP GROUP [drop_group(7)] to remove a group. USAGE
Add users to a group: ALTER GROUP staff ADD USER karl, john; Remove a user from a group: ALTER GROUP workers DROP USER beth; COMPATIBILITY
SQL92 There is no ALTER GROUP statement in SQL92. The concept of roles is similar. SQL - Language Statements 2002-11-22 ALTER GROUP(7)

Check Out this Related Man Page

CREATE 
GROUP(7) SQL Commands CREATE GROUP(7) NAME
CREATE GROUP - define a new user group SYNOPSIS
CREATE GROUP name [ [ WITH ] option [ ... ] ] where option can be: SYSID gid | USER username [, ...] INPUTS name The name of the group. gid The SYSID clause can be used to choose the PostgreSQL group id of the new group. It is not necessary to do so, however. If this is not specified, the highest assigned group id plus one, starting at 1, will be used as default. username A list of users to include in the group. The users must already exist. OUTPUTS CREATE GROUP Message returned if the command completes successfully. DESCRIPTION
CREATE GROUP will create a new group in the database installation. Refer to the Administrator's Guide for information about using groups for authentication. You must be a database superuser to use this command. Use ALTER GROUP [alter_group(7)] to change a group's membership, and DROP GROUP [drop_group(7)] to remove a group. USAGE
Create an empty group: CREATE GROUP staff; Create a group with members: CREATE GROUP marketing WITH USER jonathan, david; COMPATIBILITY
SQL92 There is no CREATE GROUP statement in SQL92. Roles are similar in concept to groups. SQL - Language Statements 2002-11-22 CREATE GROUP(7)
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