1 create table t1(f1 int,f2 int,f3 int,primary key(f1));
2 insert into t1 values(98,13,108);
3 insert into t1 values(99,14,109);
4 insert into t1 values(100,15,109);
5 create table t2(f1 int,f2 int,f3 int,primary key(f1));
6 insert into t2 values(98,13,108);
7 insert into t2 values(99,14,109);
8 insert into t2 values(100,15,109);
9 create table t3(f1 int,f2 int,f3 int,primary key(f1));
10 insert into t3 values(98,13,108);
11 insert into t3 values(100,109,109);
12 insert into t3 values(102,17,111);