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11. Using the CUSTOMERS table, you need to generate a report that shows 50% of each credit amount in each income level. The report should NOT show any repeated credit amounts in each income level.
Which query would give the required result?
A.SELECT cust_income_level, DISTINCT cust_credit_limit * 0.50
AS “50% Credit Limit”
FROM customers;
B.SELECT DISTINCT cust_income_level, DISTINCT cust_credit_limit * 0.50
AS “50% Credit Limit”
FROM customers;
C.SELECT DISTINCT cust_income_level || ‘ ‘ || cust_credit_limit * 0.50
AS “50% Credit Limit”
FROM customers;
D.SELECT cust_income_level ||’ ‘|| cust_credit_limit * 0.50 AS “50% Credit Limit”
Answer: C
12. View the Exhibit and examine the data in the CUSTOMERS table.
Evaluate the following query:
SQL> SELECT cust_name AS “NAME”, cust_credit_limit/2 AS MIDPOINT,
MIDPOINT+100 AS “MAX LOWER LIMIT”
FROM customers;
The above query produces an error on execution.
What is the reason for the error?
A.An alias cannot be used in an expression.
B.The alias NAME should not be enclosed within double quotation marks.
C.The MIDPOINT+100 expression gives an error because CUST_CREDIT_LIMIT contains NULL values.
D.The alias MIDPOINT should be enclosed within double quotation marks for the CUST_CREDIT_LIMIT/2 expression.
Answer: A
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