Ch3 Practise Q's - Database Concepts 1 Flashcards
Information is:(LO1)
A the same as data.
B data that is processed in a meaningful form.
C less useful than data.
D raw facts describing an event.
B data that is processed in a meaningful form.
Conceptual database models:(LO1)
A focus on a logical view of what is represented in the database.
B focus on a physical view of what is represented in the database.
C focus on neither a logical or physical view.
D are currently being designed to replace the relational model of databases.
A focus on a logical view of what is represented in the database.
LOGICAL
The particular values for a customer are stored in the ____ of a ____ within the customer ________.(LO2)
A fields, record, table
B record, fields, table
C fields, record, entity
D fields, table, database
A fields, record, table
Data anomalies:(LO3)
A are inconsistencies or errors that exist in a database because of entry or changes.
B are useful in ensuring the integrity of data.
C provide a useful backup function in a database.
D none of the options are correct.
A are inconsistencies or errors that exist in a database because of entry or changes.
Relational databases typically store data:(LO2)
A in a number of files.
B in a number of tables.
C in a number of fields.
D none of the options are correct.
B in a number of tables.
What is a primary key?(LO2)
A An attribute that uniquely identifies a particular row.
B An attribute that uniquely identifies a particular object.
C An attribute that identifies a row.
D An attribute that identifies a tuple.
B An attribute that uniquely identifies a particular object.
OBJECT
Which of the following elements form part of a database system?(LO4)
A Hardware, software, people, procedures and information
B Hardware, software, people, procedures and data
C Hardware, software, people, vapourware and data
D Hardware, software, people, procedures, vapourware and data
B Hardware, software, people, procedures and data
Data redundancy occurs when:(LO3)
A we keep data that has not been used by an organisation for a number of years.
B the same data is stored in multiple locations.
C emails are stored by an organisation for longer than six months.
D when we have the wrong information stored on a customer file.
B the same data is stored in multiple locations.
The DMBS contains a number of useful functions including:(LO4)
A communication interfaces
B multiuser access control
C data integrity management
D all of the options are correct.
D all of the options are correct.
The database model of choice for the development of most new information systems today is:(LO4)
A relational.
B hierarchical.
C network.
D object oriented.
A relational.
The entity–relationship model is:(LO5)
A currently being designed to replace existing database models.
B the least widely used database model.
C the most widely used database model.
D a model that utilises a physical representation of database structures.
C the most widely used database model.
The cardinality of the relationship between a student table and a university subject table is most likely to be:(LO5)
A one-to-one.
B one-to-many.
C many-to-many.
D many-to-one.
C many-to-many.
To implement a one-to-one relationship between two entities:(LO6)
A it is not necessary to have any foreign keys.
B the two entities should be combined into a single table.
C the primary key of each table should be stored in the other table as a foreign key.
D the primary key of either table can be used as a foreign key in the other table.
D the primary key of either table can be used as a foreign key in the other table.
To implement a many-to-many relationship between two entities:(LO6)
A requires a different sort of database model than relational.
B requires the introduction of an additional entity.
C requires the primary key of each table to be stored in the other table as a foreign key.
D inevitably leads to data redundancy.
B requires the introduction of an additional entity.
How is the design of a relational database determined in an organisation?(LO6)
A Each department is given an allocation of tables.
B Senior management decide how many tables are needed.
C IT professionals advise on the best design.
D By modelling the rules that describe how the business works.
D By modelling the rules that describe how the business works.