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What is a foreign key, and what is it used for?
A foreign key is used to establish relationships between relations in the relational model. Technically, a foreign key is a column (or columns) appearing in one relation that is (are) the primary key of another table. Although there might be exceptions, the values in the foreign key columns usually must correspond to values existing in the set of primary key values. This correspondence necessity is created in a database using a referential integrity constraint on the foreign key.
explain in details about one to one binary relationship
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Give an example of operations from the State Actions and Activities. For instance, in bank the activity verify account code and verify password
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explain equi-join using illustration
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What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
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