database relational model, Database Management System

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what do you mean by primary key constraint?

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Use the relational algebra to formulate query, Consider the following datab...

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In which relational modes, cardinality is termed? Answer : Cardinality is termed in a number of tuples relational modes.

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What are the DBMS languages? Briefly explain? Data Definition language (DDL):A database schema is specified through a set of definitions expressed through a special language

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What are the properties in a relation ? In a relation Ordering of rows is immaterial and No two rows are identical.

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