create table b(a varchar(10),b varchar(10),c varchar(10))
insert into b (a,b,c) values ('aaa','bbb','ccc')
insert into b (a,b,c) values ('aaa','bbb','ccc')
insert into b (a,b,c) values ('aaa1','bbb1','ccc1')
insert into b (a,b,c) values ('aaa2','bbb2','ccc2')
insert into b (a,b,c) values ('aaa2','bbb3','ccc4')
……