Notes
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DESC sites;
DESC instructors;
DESC address_type;
SELECT s.address.city, s.address.country
FROM sites s
WHERE s.address.country = 'USA'
UNION
SELECT i.address.city, i.address.country
FROM instructors i
WHERE i.address.country = 'USA';
-- to return the common cities of USA where there are both sites and instrucors
SELECT s.address.city, s.address.country
FROM sites s
WHERE s.address.country = 'USA'
INTERSECT
SELECT i.address.city, i.address.country
FROM instructors i
WHERE i.address.country = 'USA';
-- to return all addresses that are not in the instructors table
SELECT a.street,a.city, a.country
FROM addresses a
MINUS
SELECT i.address.street,i.address.city, i.address.country
FROM instructors i;
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