例程练习

• 4.1

  代码：

  CREATE USER user1 WITH PASSWORD "user1@123";
  GRANT SELECT ON TABLE student TO user1;
  

  运行结果：
  
  
  

• 4.2

  代码：

  CREATE USER user2 WITH PASSWORD "user2@123";
  CREATE USER user3 WITH PASSWORD "user3@123";
  GRANT ALL PRIVILEGES ON TABLE student, course TO user2,user3;
  

  运行结果：
  
  
  

• 4.3

  代码：

  GRANT SELECT ON TABLE sc TO public;
  

  运行结果：
  
  

• 4.4

  代码：

  CREATE USER user4 WITH PASSWORD "user4@123";
  GRANT UPDATE(sno),SELECT ON TABLE student TO user4;
  

  运行结果：
  
  
  

• 4.5

  代码：

  CREATE USER user5 WITH PASSWORD "user5@123";
  GRANT INSERT ON TABLE sc TO user5 WITH GRANT OPTION;
  验证代码
  insert into sc values ('200215129','0204',90);
  grant select on table sc to user4;
  grant insert on table sc to user4;
  grant insert on table sc to user4 with grant option;
  

  运行结果：
  
  
  

• 4.6

  代码：

  CREATE USER user6 WITH PASSWORD "user6@123";
  grant insert on table sc to user6 with grant option;
  

  运行结果：
  
  

• 4.7

  代码：

  CREATE USER user7 WITH PASSWORD "user7@123";
  grant insert on table sc to user7;
  grant insert on table sc to user1;
  

  运行结果：