The CUSTOMERS table has the following structure:
You need to write a query that does the following tasks:
1. Display the first name and tax amount of the customers. Tax is 5% of
their credit limit.
2. Only those customers whose income level has a value should be
considered.
3. Customers whose tax amount is null should not be considered.
Which statement accomplishes all the required tasks?
A.
SELECT cust_first_name, cust_credit_limit * .05 AS TAX_AMOUNT FROM customers
WHERE cust_income_level IS NOT NULL AND
tax_amount IS NOT NULL;
B.
SELECT cust_first_name, cust_credit_limit * .05 AS TAX_AMOUNT FROM customers
WHERE cust_income_level IS NOT NULL AND
cust_credit_limit IS NOT NULL;
C.
SELECT cust_first_name, cust_credit_limit * .05 AS TAX_AMOUNT FROM customers
WHERE cust_income_level <> NULL AND
tax_amount <> NULL;
D.
SELECT cust_first_name, cust_credit_limit * .05 AS TAX_AMOUNT FROM customers
WHERE (cust_income_level,tax_amount) IS NOT NULL;