702096
Description
Quiz by Ray Welland, updated more than 1 year ago
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Created by Ray Welland
over 10 years ago
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Question 1
Question
Which are TRUE in Database Development Process?
Answer
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Conceptual Data Model: Data analysis identify data requirements and capture them graphically
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Logical Model: Convert the conceptual data model into the chosen data model for implementation, e.g. Relational model
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Implementation: Implement the design using chosen DBMS software
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Data Modeller: Use the software to design the database
Question 2
Question
Design Methodology: A structured approach that uses procedures, techniques, tools, and documentation aids to support and facilitate the process of design?
Answer
- True
- False
Question 3
Question
Which is NOT True regarding Database Design Phases?
Answer
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Phase 1: Conceptual design (The process of constructing a model of the information used in an enterprise, independent of all physical consideration)
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Phase 2: Logical design (The process of constructing a model of data used in an organization based on a specific data model, but independent of a particular DBMS and other physical considerations)
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Phase 3: Physical design (The process of producing a description of the implementation of the database considering the target DBMS and other physical representations)
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Phase 4: Deployment design (Deploy the database on the chosen DBMS)
Question 4
Question
An Entity is an object or thing we wish to store information about, and when we group a set of objects with the same properties, having an independent existence as an entity
Answer
- True
- False
Question 5
Question
Relationships are associations between entities and are given a name to represent its function
Answer
- True
- False
Question 6
Question
Which is the correct Multiplicity for a One to One (1:1) relationship?
Answer
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An employ has one or less than one cars, a car belongs to only one or less employees
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An employ has one car, a car belongs to only one employee
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An employ must have one car, a car must belong to only one employee
Question 7
Question
Which is the correct Multiplicity for a One to Many (1:*) relationship?
Answer
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A student must enrol into one or many modules
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A student enrols into one module
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A student may enrols into many modules
Question 8
Question
Which is the correct Multiplicity for a Many to Many (*:*) relationship?
Answer
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A member of staff manage many properties
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Many members of staff manage many properties
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None or many members of staff manage none or many properties
Question 9
Answer
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Person doesn't have a car. A car is owned by no people
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Person may have a car. A car is owned by one person
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Person may have a car. A car is owned by one or more people
Question 10
Question
Entity attributes can be simple or composite, single or multi-valued and derived?
Answer
- True
- False
Question 11
Question
A primary key must be made of two columns that are unique within that table
Answer
- True
- False
Question 12
Question
In a relational database, relationships are expressed by foreign keys, linking one entity instance to another
Answer
- True
- False
Question 13
Question
A many-to-many relationship does not allow this relationship expression, because each record in each table may point to multiple records in the other table.
Answer
- True
- False
Question 14
Question
How would you resolve a many to many relationship?
Answer
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Introduce a third table
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Third table should have primary keys of both tables as foreign keys
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This third table will have two composite primary keys
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This third table will have a composite primary key
Question 15
Answer
-
Relationship Trap
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Fan Trap
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Entity Trap
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Ambiguous Trap
Question 16
Question
Developing an ER Model involves the following steps:
Step 1 – Identify entities,
Step 2 – Work out relationships,
Step 3 – Identify attributes,
Step 4 – Identify optionality,
Step 5 – Identify key attributes,
Step 6 – Create data dictionary
Answer
- True
- False
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