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Explain Candidate Key and Super Key
A super key is a set of one or more than attributes that, taken collectively, permits us to identify uniquely a tuple in the relation. Whereas a candidate key is a minimal superkey that can be used to uniquely identify a tuple in the relation. In superkey, there may a few extra attributes.
Explain differance between Primary and secondary storage ? Primary and secondary storage Computer storage is classified within primary(main) memory and secondary(per
Data Redundancy -A lot of information is being repeated in the relation. For instance, the information that MCS-014 is named SSAD is repetitive, address of Rahul is "D- 27, Main ro
Draw an E_R Model for the following: An organization uses number of items of a equipment to generates goods. Each item is at one LOCATION, of one TYPE and has a DETAILED_DISCRI
Example: Consider the following relations: ROLLNO NAME ADDRESS COURSE_ID 100 Ka
Determine the Disadvantages of file based systems Some of the disadvantages of file based systems are like this: Data redundancy and inconsistency: the dissimilar applic
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
What is substitutability? Any method of a class-say A can equally well be adjured with any object belonging to any subclasses B of A. This characteristic leads to code reuse, a
explain ER Modeling?
How does a query tree represent a relational algebra expression? Ans: This includes transforming an initial expression (tree) into an equivalent expression (tree) that is
what is Nested relational model? Explain with examples.
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