data a;input y $ x1 $;
cards;
a 20100911
b 20110402

c 20020309
;
run;
data b;
input y $ x2;
format x2 yymmdd10.;
cards;
a 20100911
b 20110402
;
run;
proc sql;
create table c as
select * from a,b
where a.y=b.y
and a.x1=b.x2
;
quit;



合并的时候由于x1,x2的类型不同 无法合并