insert into user values(10000, sysdate(), 'user1', 'test1', '700101-1111111');
insert into user values(10001, sysdate(), 'user2', 'test2', '800101-1231234');
insert into user values(10002, sysdate(), 'user3', 'test3', '900101-1121123');

insert into post values(10000, 'first post', 10000);
insert into post values(10001, 'second post', 10001);
insert into post values(10002, 'third post' , 10002);