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What is foreign key? A relation schema r1 derived from an ER schema may contain among its attributes the primary key of another relation schema r2.this attribute is known as a
What is recovery management component? Ensuring durability is the responsibility of a software component of the base system known as the recovery management component.
What is first normal form? The domain of attribute must contain only atomic (simple, indivisible) values.
please i request for your assistance in developing a case-based online phone repair
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
The Database Approach In order to overcome the limits of a file system, a new approach was needed. Hence a database approach emerged. A database is a persistent collection of
define attribute inheritance with example?
Define the Canonical cover Ans: A canonical cover F c for F is a set of dependencies like F logically implies all dependencies in F c , and F c logically entails all dependen
Explain P command in the respect of QBE? P: It is the command in which is used to print (logically display) the value of the attribute in whose cell it is writ
How nulls are treated in comparison operator? Along with comparison (relational) operators, the null values are ignored as we cannot derive the relation along with the given op
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