假设表orderitem有列orderid(int类型)和列thenumber(int类型),则下列语句可以正确执行的是(选一项)()
A.Select * from orderitem where orderid<=2 order by orderid Compute sum(thenumber) by orderid
B.Select * from orderitem where orderid<=2 Compute sum(thenumber) by orderid
C.Select * from orderitem where orderid<=2 order by henumber Compute sum(thenumber) by orderid
D.Select * from orderitem where orderid<=2 order by orderid Compute sum(orderid) by thenumber
A、Select * from orderitem where orderid<=2 order by orderid Compute sum(thenumber) by orderid