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Question ID 4735

See the Exhibits and examine the structures of PRODUCTS, SALES and CUSTOMERS table: Exhibit1:
 
Exhibit 2:
  
Exhibit 3:
 
 
You issue the following query: Exhibit:
 
Which statement is true regarding the outcome of this query?

Option A

A.    It produces an error because all columns used in the NATURAL join should have a qualifier
 

Option B

B.    It produces an error because a column used in the NATURAL join cannot have a qualifier
 

Option C

C.    It produces an error because the NATURAL join can be used only with two tables
 

Option D

D.    It executes successfully
 

Correct Answer B
Explanation


Question ID 4736

See the Exhibit and examine the structure of the CUSTOMERS table:
Exhibit:
 
 
Using the CUSTOMERS table, you need to generate a report that shown the average credit limit for customers in WASHINGTON and NEW YORK.
Which SQL statement would produce the required result?

Option A

A.    SELECT cust_city,AVG(cust_credit_limit)
FROM customers
WHERE cust_city IN ('WASHINGTON','NEW YORK') GROUP BY cust_city;
 

Option B

B.    SELECT cust_city,AVG(cust_credit_limit)
FROM customers
WHERE cust_city IN ('WASHINGTON','NEW YORK') GROUP BY cust_city,cust_credit_limit;
 

Option C

C.    SELECT cust_city,AVG(cust_credit_limit)
FROM customers
WHERE cust_city IN ('WASHINGTON','NEW YORK') GROUP BY cust_credit_limit,cust_city;
 

Option D

D.    SELECT cust_city,AVG(NVL(cust_credit_limit,0)) FROM customers
WHERE cust_city IN ('WASHINGTON','NEW YORK')
 

Correct Answer A
Explanation

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