Case Study 2 - Complete Pet Care

Essay

Case Study 2 - Complete Pet Care

For a more complete description, see Case Study 4 under Chapter 22.
-Consider the above relational schema. Map the following query onto a relational algebra tree, and then transform it into a reduced query.Give a full explanation of the reasoning behind each step and state any transformation rules used during the reduction process.
SELECT P.petNo, petName, oName, oAddress
FROM Pet P, Owner O, Prescription P, Medication M
WHERE PR.medNo = M.medNo AND
PR.petNo = P.petNo AND
P.ownerNo = O.ownerNo AND
medName = ' Provac' AND
unitsPerDay > 200 AND
petDescription = 'Setter';