两表相同记录标记
create cursor b1 (jnh n(1),mc c(2),有否 c(2))insert into b1 values (1,"A1","无")
insert into b1 values (2,"A2","有")
insert into b1 values (3,"A3","无")
insert into b1 values (4,"A4","无")
insert into b1 values (5,"A5","有")
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")
b1中与b2记录相同，标记为“有”,否则为"无"，如b1,谢谢！
