--- sidebar_position: 45 sidebar_label: USER --- # ALTER USER {#alter-user-statement} Changes ClickHouse user accounts. Syntax: ``` sql ALTER USER [IF EXISTS] name1 [ON CLUSTER cluster_name1] [RENAME TO new_name1] [, name2 [ON CLUSTER cluster_name2] [RENAME TO new_name2] ...] [NOT IDENTIFIED | IDENTIFIED {[WITH {no_password | plaintext_password | sha256_password | sha256_hash | double_sha1_password | double_sha1_hash}] BY {'password' | 'hash'}} | {WITH ldap SERVER 'server_name'} | {WITH kerberos [REALM 'realm']}] [[ADD | DROP] HOST {LOCAL | NAME 'name' | REGEXP 'name_regexp' | IP 'address' | LIKE 'pattern'} [,...] | ANY | NONE] [DEFAULT ROLE role [,...] | ALL | ALL EXCEPT role [,...] ] [GRANTEES {user | role | ANY | NONE} [,...] [EXCEPT {user | role} [,...]]] [SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [READONLY | WRITABLE] | PROFILE 'profile_name'] [,...] ``` To use `ALTER USER` you must have the [ALTER USER](../../../sql-reference/statements/grant.md#grant-access-management) privilege. ## GRANTEES Clause {#grantees} Specifies users or roles which are allowed to receive [privileges](../../../sql-reference/statements/grant.md#grant-privileges) from this user on the condition this user has also all required access granted with [GRANT OPTION](../../../sql-reference/statements/grant.md#grant-privigele-syntax). Options of the `GRANTEES` clause: - `user` — Specifies a user this user can grant privileges to. - `role` — Specifies a role this user can grant privileges to. - `ANY` — This user can grant privileges to anyone. It's the default setting. - `NONE` — This user can grant privileges to none. You can exclude any user or role by using the `EXCEPT` expression. For example, `ALTER USER user1 GRANTEES ANY EXCEPT user2`. It means if `user1` has some privileges granted with `GRANT OPTION` it will be able to grant those privileges to anyone except `user2`. ## Examples {#alter-user-examples} Set assigned roles as default: ``` sql ALTER USER user DEFAULT ROLE role1, role2 ``` If roles aren’t previously assigned to a user, ClickHouse throws an exception. Set all the assigned roles to default: ``` sql ALTER USER user DEFAULT ROLE ALL ``` If a role is assigned to a user in the future, it will become default automatically. Set all the assigned roles to default, excepting `role1` and `role2`: ``` sql ALTER USER user DEFAULT ROLE ALL EXCEPT role1, role2 ``` Allows the user with `john` account to grant his privileges to the user with `jack` account: ``` sql ALTER USER john GRANTEES jack; ```