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statical data
For the relations R and S given below: R S A B C 1 4 7 2 5 8 3 6 9
Define the concept of aggregation. Give two examples where this concept is useful. Ans: Aggregation transforms a relationship among the objects into a higher-level object. A
The users who use easy-to-use menu are called ? The users who use easy to use menu are called as Naïve users.
to develop elrctronic database from manual forms
What are data models? Explain it detail? Entity relationship model Rectangles Ellipse Diamonds Lines Relational model Relational model use a collection
Physical Records These are the records that are stored in the secondary storage devices. For the database relation, physical records are the group of fields kept in adjacent me
Explain the ACID properties of a transaction Ans: ACID properties are a significant concept for databases. The ACID stands for Atomicity, Consistency, Isolation, and Durability
what is data link layer
what problems are raised by the database? why is it so controversial? why is data quality an issue?
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