1. Which statement is true regarding the COALESCE function? A. It can have a maximum of five expressions in a list B. It returns the highest NOT NULL value in the list for all rows C. It requires that all expressions in the list must be of the same data type D. It requires that at least one of the expressions in the list must have a NOT NULL value Answer: C 2. View the Exhibit and examine the structure of the PROMOTIONS table. Which SQL statements are valid? (Choose all that apply.) A. SELECT promo_id, DECODE (NVL(promo_cost,0), promo_cost, promo_cost * 0.25, 100) "Discount" FROM promotions; B. SELECT promo_id, DECODE (promo_cost, 10000, DECODE (promo_category, 'G1', promo_cost *.25, NULL), NULL) "Catcost" FROM promotions; C SELECT promo_id, DECODE(NULLIF(promo_cost, 10000), NULL, promo_cost*.25, 'N/A') "Catcost" FROM promotions; D. SELECTpromo_id,DECODE(promo_cost, >10000, 'High',<10000, 'Low') "Range" FROM promotions; Answer: A, B 3. View the Exhibit and examine the structure of ORDERS and CUSTOMERS tables. There is only one customer with the cust _last_name column having value Roberts. Which INSERT statement should be used to add a row into the ORDERS table for the customer whose CUST LAST NAME is Roberts and CREDIT LIMIT is 600? A. INSERT INTO orders VALUES (1, '10-mar-2007', 'direct', (SELECT customer_id FROM customers WHERE cust last name= 'Roberts' AND credit_limit=600), 1000); B. INSERT INTO orders (order_id,order_date,order_mode, (SELECT customer_id FROM customers WHERE cust last name= 'Roberts' AND credit_limit=600),order_total) VALUES(1, '10-mar-2007', 'direct', &&customer_id, 1000); C. INSERT INTO(SELECT o.order_id, o.order_date,o.order_mode,c.customer_id, o.order_total FROM orders o, customers c WHERE o....
