任务：创建角色
1）创建角色sse_role，授予create session 权限
2）创建角色tblo_role，授予CREATE PROCEDURE, CREATE SEQUENCE, CREATE SYNONYM, CREATE TABLE, CREATE TRIGGER, CREATE TYPE, CREATE VIEW 权限

操作过程：

create role sse_role;

grant create session to sse_role;

create role tblo_role;

grant CREATE PROCEDURE, CREATE SEQUENCE, CREATE SYNONYM, CREATE TABLE, CREATE TRIGGER, CREATE TYPE, CREATE VIEW to tblo_role;