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What is the difference between a key and a superkey?
Key - A key a single attribute or a combination of two or more attributes of an entity set which is used to identify one or more examples (rows) of the set (table). It is a minimal combination of attributes.
Super Key - A super key is a set of one or more attributes in which, taken collectively, permits us to identify uniquely a tuple within the relation.
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
About Attribute inheritance
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anyone have a textbook solutions case fair, 8 edition of vol 1 ?, please give me
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