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Define Partial Key and Primary Key
A partial key, also known as discriminator, is the set of attributes which can uniquely identify weak entities that are related to similar owner entity. Primary key is a unique key but not comprise null values. An entity set can comprise at most one primary key.
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
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Benefits of using heuristics
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What are multiple inheritances? Multiple inheritances allow a class to inherit variables and methods from many super classes.
Foreign Keys and NULL Let us take the relation: DEPT DEPT ID DNAME BUDGET D1 M
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