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Question:
(a) Can a set of data requirements be correctly modelled by two or more different ER diagrams? Explain your answer. You may use a small example, if you think it will help your explanation.
(b) What is a recursive relationship? Give an example of a many to many recursive relationship.
This question refers to the Appendix where the relational schema for an online DVD rental system is defined.
(c) Express the following queries using relational algebra:
(i) Find all DVD titles with their certificate being ‘15' and their type name being ‘Drama'
(ii) Find names of all members and the titles of DVDs, which they have rented between 1st
May 2007 and 31st May 2007
(iii) Find names of all the members who have rented any DVD with type name ‘Comedy' but not any DVD with Type name ‘Action'
What is Normalization? Database normalization is a data design and organization method applied to data structures based on rules that help building relational databases. In rel
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what is Lossless-join decomposition
Consider student (std_id, std_name, date_of_birth, phone, dept_name). Put the data for a student with student id200, name arun, birth date 1 February, 1985, phone number (01110 328
Define the terms i) Key attribute ii) Value set Key attribute: An entity type usually has an attribute whose values are exact from each individual entity in the collection. Su
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Define union compatibility? Explain why INTERSECTION of two relations cannot be performed if they are not union compatible? Two relations R(A1, A2,-------, An) and S(B1, B2,--
Define the Query optimisation The query parser commonly generates a standard initial tree to correspond to an SQL query, with no doing any optimization. Such type of a canonica
Write short notes on domain relational calculus The domain relational calculus uses domain variables that take on values from an attribute domain rather than values for whole
(a) Why did SAP introduce the extended star schema?
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