ALTER USER 

Changes ClickHouse user accounts.

Syntax:

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 [,...] ]
    [SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [READONLY | WRITABLE] | PROFILE 'profile_name'] [,...]

To use ALTER USER you must have the ALTER USER privilege.

Examples 

Set assigned roles as default:

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:

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:

ALTER USER user DEFAULT ROLE ALL EXCEPT role1, role2

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