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Which normal form is considered adequate for normal relational database design?

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Important Questions on Database Management System

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Which of the following statement manages the changes made by DML statement?
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A second normal form does not permit _____ dependency between a non-prime attribute and the relation key.
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The number of tuples in a relation is called its _____ While the number of attributes in a relation is called its _____.
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Which of the following is false for a query?
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Which of the following are invalid SQL language elements?
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Which of the following categories of the data integrity RDBMS will enforce specific business rules?