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Relational Database Design
The following question is based upon the Patient-Treatment relation which records the details of transactions occurring in a medical surgery. You may assume the data are representative.
You have been asked to design a relational database for this system. You know that there are problems with the current design and that it will need to be modified in order to work effectively. You need to write a 1-2 page report that addresses the following: 1. What are the specific problems associated with the current design and why do they arise? 2. How would you change the current design and how does your new design address the problems you have identified with the current design. In order to receive high marks for this question, you will need to demonstrate an understanding of the theories discussed in Topics 1, 2 and 3, how they apply to this problem, and justify the changes you are making to the system. Simply providing the amended design (even if it is correct) will only attract a small percentage of the marks for this question.
Design the Update trigger on Part table which raises an error string if Count field of updated row has a higher value than value prior to Update.
A database is to be created for University to monitor students' progress throughout their course of study. Students are reading for degree (such as BTech, BTech(Hons) MCA, etc) within framework of modular system.
What criteria would you use in selecting a life-cycle model for the project?
What is Recovering a database via rollforward? What is aim of transaction log? What is contained in transaction log?
Write SQL queries for the books database that perform each of the following tasks: Select all authors from the Authors table with the columns in the order lastName, firstName and authorID.
What is your recommendation for this policy and process? Does the reason for leaving the company affect the recommendation? Why or why not? Be specific and explain your reasoning.
Describing the purpose of database an its functionality, plus a detailed E-R diagram.
We want to construct a database for a world-wide package delivery company. Define a set of relational schemas and identify primary and foreign keys. Try not to include redundant schemas.
Consider relation schema r(A,B,C,D,E, F) and a set of functional dependencies {A BCD,BCDE,BD,DA}. Calculate canonical cover for set of functional dependencies (show each step of your derivation with an explanation).
Compute the closure sets of R - find all non-trivial dependencies and what are the candidate keys of R?
What are the main activities that the business undertakes and where in the business are the crucial decisions made?
Relational Algebra- The database used for this question is a very simple one with the following schema: (Primary keys are bold, foreign keys are underlined)
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