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Evaluate the following SQL statement: SQL> SELECT cust_id, cust_last_name "Last Name" FROM customers WHERE country_id = 10 UNION SELECT cust_id CUST_NO, cust_last_name FROM customers WHERE country_id = 30; Which ORDER BY clause are valid for the above query? (Choose all that apply.)
Correct Answer: A,C,E
Explanation/Reference: Explanation: Using the ORDER BY Clause in Set Operations - The ORDER BY clause can appear only once at the end of the compound query. - Component queries cannot have individual ORDER BY clauses. - The ORDER BY clause recognizes only the columns of the first SELECT query. - By default, the first column of the first SELECT query is used to sort the output in an ascending order.