Answer:
An uninterruptible power supply is an electrical apparatus that provides emergency power to a load when the input power source or mains power fails.
Explanation:
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Correct Answer:
c.
SELECT InvoiceNumber, VendorName
FROM Invoices JOIN Vendors ON Invoices.VendorID = Vendors.VendorID
WHERE InvoiceTotal IN (SELECT MAX(InvoiceTotal) FROM Invoices)
Explanation:
All options only differ on the WHERE clause:
a: WHERE InvoiceTotal = MAX(InvoiceTotal)
Fails because aggregate functions (like MAX, COUNT, etc) have to be used on the SELECT clause.
b: WHERE InvoiceTotal = (SELECT MAX(InvoiceTotal))
Fails because the SELECT clause is incomplete.
c: WHERE InvoiceTotal IN (SELECT MAX(InvoiceTotal) FROM Invoices)
This one is correct, and returns the InvoiceNumber and VendorName register with the largest value on the InvoiceTotal field.
I believe that this is true.
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