比如说我用如下语句：
proc sql;
create table invest
(stkcd char(6),inv num,
constraint prim_key primary key(stkcd),
constraint inv check(inv ge 0));
create table prinfo
(stkcd char(6), price num,
constraint for_key foreign key(stkcd)
     references invest
  on delete restrict
  on update set null,
constraint price check(price ge 0));
quit;

建立了表，如果要用data步往里输数据可行吗？可行的话如何输呢？