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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 Identify three ORDER BY clauses either one of which can complete the query. (Choose three.)
Correct Answer: A,B,D
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.