ER diagram in database, Database Management System

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What is an ER diagram? Why is it used in Database management system (DBMS)?

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Data, Explain three main attributes of data.

Explain three main attributes of data.

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During the deletion of a tuple two cases can happen: Deletion of tuple in relation having the foreign key: In this type of case simply delete the desired tuple. For example, in

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Creation of Indexes Automatically: When a primary key or Unique constraint is show in a table definition then a unique index is formed automatically. Manually: User can

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Define multivalued dependency.  What do understand by trivial multivalued dependency?  Ans: A multivalued dependency is a full constraint among two sets of attributes in a rela

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