SET [ SESSION | LOCAL ] ROLE role_name SET [ SESSION | LOCAL ] ROLE NONE RESET ROLE
This command sets the current user identifier of the current SQL session to be
role_name. The role name can be written as either an identifier or a string literal. After
SET ROLE, permissions checking for SQL commands is carried out as though the named role were the one that had logged in originally.
role_name must be a role that the current session user is a member of. (If the session user is a superuser, any role can be selected.)
LOCAL modifiers act the same as for the regular SET command.
RESET forms reset the current user identifier to be the current session user identifier. These forms can be executed by any user.
Using this command, it is possible to either add privileges or restrict one's privileges. If the session user role has the
INHERITS attribute, then it automatically has all the privileges of every role that it could
SET ROLE to; in this case
SET ROLE effectively drops all the privileges assigned directly to the session user and to the other roles it is a member of, leaving only the privileges available to the named role. On the other hand, if the session user role has the
SET ROLE drops the privileges assigned directly to the session user and instead acquires the privileges available to the named role.
In particular, when a superuser chooses to
SET ROLE to a non-superuser role, she loses her superuser privileges.
SET ROLE has effects comparable to SET SESSION AUTHORIZATION, but the privilege checks involved are quite different. Also,
SET SESSION AUTHORIZATION determines which roles are allowable for later
SET ROLE commands, whereas changing roles with
SET ROLE does not change the set of roles allowed to a later
SET ROLE does not process session variables as specified by the role's ALTER ROLE settings; this only happens during login.
SET ROLE cannot be used within a
SECURITY DEFINER function.
SELECT SESSION_USER, CURRENT_USER; session_user | current_user --------------+-------------- peter | peter SET ROLE 'paul'; SELECT SESSION_USER, CURRENT_USER; session_user | current_user --------------+-------------- peter | paul
PostgreSQL allows identifier syntax (
"rolename"), while the SQL standard requires the role name to be written as a string literal. SQL does not allow this command during a transaction; PostgreSQL does not make this restriction because there is no reason to. The
LOCAL modifiers are a PostgreSQL extension, as is the
© 1996–2017 The PostgreSQL Global Development Group
Licensed under the PostgreSQL License.