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Order database of the Company: Customer(CustID, CustName) Order(OrderID, CustID, OrderDate)  what type of integrity is this?

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Important Questions on Database Management System

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Computer Awareness and Information Technology>Database Management System>Database Management System>Data Integrity and Data Security in DBMS
The run-time stack is characterized by
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Mark the methods of database security :
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Integrity Constraints types:
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"_____" means that the data contained in a database is accurate and reliable.

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How to secure your database server?
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 A Index on an attribute of a relation is a data structure that allows the database system to find those tuples in the relation that have a specified value for that attribute efficiently, without scanning through all the _____ of the relation.
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The primary key is a unique value that identifies each row. This requirement is called the ______ constraint .
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Is NULL value allowed in the FOREIGN KEY column?