SET ROLE {DEFAULT | NONE | role [,...] | ALL | ALL EXCEPT role [,...]}
```
## SET DEFAULT ROLE {#set-default-role-statement}
Sets default roles to a user.
Default roles are automatically activated at user login. You can set as default only the previously granted roles. If the role isn’t granted to a user, ClickHouse throws an exception.
``` sql
SET DEFAULT ROLE {NONE | role [,...] | ALL | ALL EXCEPT role [,...]} TO {user|CURRENT_USER} [,...]
```
## Examples {#set-default-role-examples}
Set multiple default roles to a user:
``` sql
SET DEFAULT ROLE role1, role2, ... TO user
```
Set all the granted roles as default to a user:
``` sql
SET DEFAULT ROLE ALL TO user
```
Purge default roles from a user:
``` sql
SET DEFAULT ROLE NONE TO user
```
Set all the granted roles as default excepting some of them:
