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Define- relational algebra.
The relational algebra is a procedural query language. It having of a set of operations that take one or two relation as input and make a new relation as output.
why data in an RDMS need to be normalised
Improved performance: As the data is located near the site of its demand, and given the inherent parallelism because of multiple copies, speed of database access may be good for di
Benefits and Limitations od Data Models?
QUESTION (a) Consider a car database consisting of car model, car make, car origin, Engine capacity, color, cost.
er diagram on cosmetics.
Write a query that display ename annual salary and comm from emp table
Determine the Other System Design Issue How to realise subsystems; through hardware or software? How is object model mapped on chosen hardware software? Mapping
How does Tuple-oriented relational calculus vary from domain-oriented relational calculus? The tuple-oriented calculus uses a tuple variables i.e., variable whose only allowed
Explain what is Aggregation ? Aggregation: This is used whenever we intend to show a relationship between an entity and the relationship. There is no provision for this in th
why are older data base model are being replaced by new data model
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