View the Exhibit and examine the structure of the ORDERS and ORDER_ITEMS tables.
Evaluate the following SQL statement:
SELECT oi.order_id, product_id, order_date
FROM order_items oi JOIN orders o
USING(order_id);
Which statement is true regarding the execution of this SQL statement?
A.
The statement would not execute because table aliases are not allowed in the JOIN clause.
B.
The statement would not execute because the table alias prefix is not used in the USING clause.
C.
The statement would not execute because all the columns in the SELECT clause are not prefixed with table aliases.
D.
The statement would not execute because the column part of the USING clause cannot have a qualifier in the SELECT list.
plz tell me what is qualifier
select x.sal from emp i join empu x using (empno);
select x.sal, job from emp i join empu x using (empno);
select i.sal, job from emp i join empu x using (empno);