insert SC (sno,cno,grade)
values(1,'c1',88);
insert SC (sno,cno,grade)
values(1,'c2',68);
insert SC (sno,cno,grade)
values(1,'c3',97);
insert SC (sno,cno,grade)
values(2,'c1',69);
insert SC (sno,cno,grade)
values(2,'c2',78);
insert SC (sno,cno,grade)
values(2,'c3',89);
