Question: write select statement that returns vendorID pairs that have the same zip code; also return the vendor ZipCode. Now, vendor ID#17 obviously has the same
write select statement that returns vendorID pairs that have the same zip code; also return the vendor ZipCode. Now, vendor ID#17 obviously has the same vendor Zip Code as vendor ID#17; however, do not return a pair unless it contains two different vendorID values. use self join
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