The University of Melbourne School of Computing and Information Systems INFO20003 Database Systems Miscellaneous practice questions Data modelling 1. Select appropriate MySQL data types for the following pieces of information: a. A person’s last name b. The number of items purchased in a particular transaction c. The average number of items purchased d. A phone […]
INFO20003 Exam – Semester 1 Suggested Solutions and Marking Scheme Oscar Correa and Colton Carner July 2020 0.1 ER Modelling I (Exam Q8 – 15 marks) 0.1.1 VicRoads VicRoads wants to upgrade its database and it hired you to be in charge of the design of the roadwor- thiness certificates section. The relevant information is
Database Fundamentals Database Fundamentals Normalisation Concepts Normalisation Database designs can be generated by decomposing “Mega” relational schemas into smaller schemas Based on knowledge of the attributes and relationships between them called Functional Dependencies (FDs) These smaller relations satisfy some normal form in that they contain fewer anomalies and that there is no loss of information
CS3402 Tutorial 3: 1. Suppose each of the following Update operations is applied directly to the database below. Discuss all integrity constraints violated by each operation, if any, and the different ways of enforcing these constraints: (a) Insert < 'ProductA', 4, 'Bellaire', 2 > into PROJECT. (b) Insert < 'Production', 4, '943775543', '01-OCT-88' > into
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CS3402 Tutorial 3: 1. Suppose each of the following Update operations is applied directly to the database below. Discuss all integrity constraints violated by each operation, if any, and the different ways of enforcing these constraints: (a) Insert < 'ProductA', 4, 'Bellaire', 2 > into PROJECT. (b) Insert < 'Production', 4, '943775543', '01-OCT-88' > into
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CS3402 Database Systems Tutorials CS3402 Tutorial 5: 1. We are going to design a database for the CS3402 course to keep track the information about students who are taking this course. In this course, each student can be assigned to one optional group discussion section with more than one participant. Each group discussion section
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CS3402 Database Systems Tutorials CS3402 Tutorial 5: 1. We are going to design a database for the CS3402 course to keep track the information about students who are taking this course. In this course, each student can be assigned to one optional group discussion section with more than one participant. Each group discussion section
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CS3402 1 CS3402 – Chapter 3 Integrity Constraints Database Modelling and Implementation Ideas/requirements E/R design Relational schema Relational database CS3402 2 Summary of ER-Diagram Notation Symbol Meaning ENTITY TYPE WEAK ENTITY TYPE RELATIONSHIP TYPE IDENTIFYING RELATIONSHIP TYPE ATTRIBUTE (Primary) KEY ATTRIBUTE MULTIVALUED ATTRIBUTE COMPOSITE ATTRIBUTE DERIVED ATTRIBUTE TOTAL PARTICIPATION OF E2 IN R CARDINALITY RATIO
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CS3402 Database Systems Tutorials CS3402 Tutorial 4: 1. Examine the table shown below. Branch (a) Why this table is not in 1NF? (b) Describe and illustrate the process of normalizing the data shown in this table to third normal form (3NF). Answer: (a) TelNo is not an attribute with atomic values, but with multi-values. So,
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CS3402 1 CS3402 : Chapter 4 Normal Forms Functional Dependency Functionaldependencyisaconstraintbetweentwosetsof attributes from the database Formaldefinition: Let R be a relation schema, and R, R (i.e., and are sets of R’s attributes). We say: If in any relation instance r(R), for all pairs of
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