AlterRoleStmt::= GRANT ROLE role_name TO user_name_1[, user_name_2 [, ...] ]
role_name
user_name_1, user_name_2, ...
将已创建的角色role_1授予用户usr_1和用户usr_2。
role_1
usr_1
usr_2
SQL> GRANT ROLE role_1 TO usr_1, usr_2;