Oracle的四道经典面试题分享

create table test(
 id number(10) primary key,
 type number(10) ,
 t_id number(10),
 value varchar2(6)
);

insert into test values(100,1,1,'张三');
insert into test values(200,2,1,'男');
insert into test values(300,3,1,'50');

insert into test values(101,1,2,'刘二');
insert into test values(201,2,2,'男');
insert into test values(301,3,2,'30');

insert into test values(102,1,3,'刘三');
insert into test values(202,2,3,'女');
insert into test values(302,3,3,'10');

select * from test;