两表相同记录筛选

create cursor b1 (jnh n(1),mc c(2))
insert into b1 values (1,"A1")
insert into b1 values (2,"A2")
insert into b1 values (3,"A3")
insert into b1 values (4,"A4")
insert into b1 values (5,"A5")

create cursor b2 (jnh n(1),mc c(2))
insert into b2 values (1,"A2")
insert into b2 values (2,"A5")
insert into b2 values (3,"C1")
 在b1中查mc与b2中mc相同的记录。谢谢！