text: -- @testpoint: 将表中字段的查询权限赋予指定的用户或角色
  
  drop user if exists user_007 cascade;
  create user user_007 identified by 'Gauss_234';
  
  drop table if exists t7;
  create table t7(id int ,name char(255),age int ,city varchar (255));
  grant select (id,name) on t7 to user_007;
  -- set search_path to user_007;
  -- select id,name FROM t7;
  revoke select on t7 from user_007;
  
  drop table if exists t7;
  drop user if exists user_007;
  
  