Consider two relations Order and Product with the schema Order (Oid, Odate, Pid, qty) and Product (Pid, manufacturer_id, unit_price). i) Can the Oid attribute in the relation Order be a candidate key of the relation? Justify your answer. ii) Can the Pid attribute in the relation Product be a candidate key of the relation? Justify your answer. iii) Find the candidate key for the relation Product.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Consider two relations Order and Product with the schema Order (Oid, Odate, Pid, qty) and Product (Pid, manufacturer_id, unit_price). i) Can the Oid attribute in the relation Order be a candidate key of the relation? Justify your answer. ii) Can the Pid attribute in the relation Product be a candidate key of the relation? Justify your answer. iii) Find the candidate key for the relation Product. iv) Using the primary keys identified for the above relations write a SQL query that retrieves all tuples of the form (Oid, Odate, Pid, unit_price).
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