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Quiz von Kyle Peterson, aktualisiert more than 1 year ago
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Erstellt von Kyle Peterson
vor mehr als 3 Jahre
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Frage 1
Frage
If a foreign key contains either matching values or nulls, the tables that make use of such a foreign key are said to exhibit ________ integrity.
Antworten
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referential
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entity
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secondary
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restrictive
Frage 2
Frage
Nulls, if used improperly, can create problems because they can represent __________.
Antworten
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a missing attribute value
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a default value
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an unsortable attribute value
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a zero
Frage 3
Frage
How is a strong relationship depicted in a Crow's Foot ERD?
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no line
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solid line
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dotted line
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double line
Frage 4
Frage
Relational Database model was proposed by?
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Larry Ellison
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Bill Gates
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P. Chan
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E. F. Codd
Frage 5
Frage
BCNF is an extension of 3NF.
Antworten
- True
- False
Frage 6
Frage
Repeating groups are eliminated in
Antworten
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1NF
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2NF
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3NF
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BCNF
Frage 7
Frage
Relational databases follow ACID transactions. They do not allow multiple transactions occuring at the same time to impact each others execution. This particular characteristic of ACID is called ________
Antworten
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Atomicity
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Consistency
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Isolation
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Durability
Frage 8
Frage
In a relationship, when a primary key from one table is also defined in a second table, the field is referred to as a ______ in a second table.
Antworten
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foreign key
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composite key
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super key
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primary key
Frage 9
Frage
Supertype can have many subtypes.
Antworten
- True
- False
Frage 10
Frage
Which one of the following is NOT part of ensuring 1NF?
Antworten
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Remove repeating groups
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Remove partial dependencies
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Remove multi-valued attributes
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Establish a primary key
Frage 11
Frage
Which of the following type(s) of attributes need not be physically stored within the database?
Antworten
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Multivalued
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Composite
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Derived
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None of the above
Frage 12
Frage
What is an advantage of a DBMS?
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Data security
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Data sharing
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Data access
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Data backup
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All of the above
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None of the above
Frage 13
Frage
Entity supertypes and subtypes are organized in a(n) ______.
Antworten
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overlapping hierarchy
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specialization hierarchy
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linear hierarchy
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generalization hierarchy
Frage 14
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Big data is a collection of datasets so large and complex that it becomes difficult to process using traditional database management tools or data processing applications.
Antworten
- True
- False
Frage 15
Frage
All databases must meet
Antworten
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1NF
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2NF
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3NF
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4NF
Frage 16
Frage
Which one of the following is NOT true about a null value?
Antworten
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An unknown attribute value
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A known, but missing, attribute value
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An inapplicable condition
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A value equal to zero
Frage 17
Frage
An Insert Anomaly occurs when certain attributes are inserted into the database without the presence of other attributes.
Antworten
- True
- False
Frage 18
Frage
Which one of the following is NOT mentioned in the Gartner's definition of big data?
Antworten
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Volume
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Variety
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Veracity
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Velocity
Frage 19
Frage
The ______ adds support for entity supertypes, subtypes, and entity clustering.
Antworten
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object-oriented model
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extended entity-relationship model
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relational model
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hierarchical entity model
Frage 20
Frage
Which of the following is NOT an example of a multivalued attribute?
Antworten
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A person's social security number
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Degree(s) held by a person
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A car's color(s)
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Phone number(s) in a household
Frage 21
Frage
___________________ means that every supertype occurence must be a member of at least one subtype.
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Total subtypes
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Partial completeness
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Specialization subtypes
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Total completeness
Frage 22
Frage
An entity in the logical design becomes a ________ in the corresponding physical design.
Antworten
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database
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table
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attribute
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relationship
Frage 23
Frage
Which one of the following is NOT a relational database?
Antworten
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SQL Server
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Oracle
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MySQL
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MongoDB
Frage 24
Frage
____________________ is a field that can have many values for a single entity occurence.
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multivalued attribute
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multivalued entity
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null
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repeating group
Frage 25
Frage
Each table must have a ___________ key.
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primary
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foreign
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domain
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composite
Frage 26
Frage
An attribute or a combination of attributes that uniquely identifies any given row is called ____________.
Antworten
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primary key
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foreign key
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composite key
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All of the above
Frage 27
Frage
Referential integrity means that, if the foreign key contains a value, that value refers to an existing valid tuple (row) in another relation.
Antworten
- True
- False
Frage 28
Frage
A surrogate primary key is an "artificial" primary key that is used to uniquely identify each entity occurrence when there is no good natural key available.
Antworten
- True
- False
Frage 29
Frage
How would you graphically identify an entity in a Crow's Foot model ERD?
Antworten
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a line
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a square
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a rectange
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a diamond
Frage 30
Frage
About 80% of all data are believed to be in unstructured form.
Antworten
- True
- False
Frage 31
Frage
CAP Theorem allows multiple user views in relational databases.
Antworten
- True
- False
Frage 32
Frage
As a general rule, a ______________ in a business rule will translate into a(n) ___________ in the model, and a(n) ___________ associating nouns will translate into a(n) ___________ among the entities.
Antworten
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verb, entity, noun, relationship
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noun, entity, verb, relationship
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noun, relationship, verb, entity
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verb, relationship, noun, entity
Frage 33
Frage
Which of the following is true of business rules?
Antworten
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They allow the designer to set company policies with regard to data.
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They allow the designer to develop business processes.
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They can serve as a communication tool between the users and designers.
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They provide a framework for the company's self-actualization.
Frage 34
Frage
A(n) is a restriction placed on the data.
Antworten
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attribute
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entity
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relationship
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constraint
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