6274649
Questão 1
Questão
1) An ERM is dependent on the database type.
Responda
- True
- False
Questão 2
Questão
2) The word “entity” in the ER model corresponds to a table.
Responda
- True
- False
Questão 3
Questão
3) The Crow’s Foot model is less implementation-oriented than the Chen model.
Responda
- True
- False
Questão 4
Questão
4) The ER diagram represents the conceptual database as viewed by the end user.
Responda
- True
- False
Questão 5
Questão
5) The ER model refers to a specific table row as an entity instance.
Responda
- True
- False
Questão 6
Questão
6) In both the Chen and Crow’s Foot models, an entity is represented with a rectangle containing the entity’s name.
Responda
- True
- False
Questão 7
Questão
7) The ER model refers to a specific table row as an entity occurrence.
Responda
- True
- False
Questão 8
Questão
8) Attributes are types of entities.
Responda
- True
- False
Questão 9
Questão
9) In the original Chen model, each attribute is represented using an oval with the
attribute name connected to the entity with a line.
Responda
- True
- False
Questão 10
Questão
10. Software vendors have adopted the Chen representation because of its compact
representation.
Responda
- True
- False
Questão 11
Questão
11) Attributes have a domain that specifies the data type of the attribute.
Responda
- True
- False
Questão 12
Questão
12) Attributes cannot share a domain.
Responda
- True
- False
Questão 13
Questão
13) In an ER diagram, primary keys are usually bolded.
Responda
- True
- False
Questão 14
Questão
14. Ideally, a primary key is composed of several attributes.
Responda
- True
- False
Questão 15
Questão
15. A composite identifier is a primary key composed of more than one attribute.
Responda
- True
- False
Questão 16
Questão
16. All attributes are either simple or composite.
Responda
- True
- False
Questão 17
Questão
17) All simple attributes are also single-valued.
Responda
- True
- False
Questão 18
Questão
18) In the Chen model, a multivalued attribute is connected to the owning entity
with a double line.
Responda
- True
- False
Questão 19
Questão
19) The DBMS can easily handle multivalued attributes.
Responda
- True
- False
Questão 20
Questão
20) Derived attributes are stored in a special database table.
Responda
- True
- False
Questão 21
Questão
21) A relationship is identified by a name that describes the relationship.
Responda
- True
- False
Questão 22
Questão
22) Cardinality expresses the minimum and maximum number of entity occurrences associated with one occurrence of the related entity.
Responda
- True
- False
Questão 23
Questão
23) In Chen notation, there is no way to represent cardinality.
Responda
- True
- False
Questão 24
Questão
24) Connectivities and cardinalities are established by business rules.
Responda
- True
- False
Questão 25
Questão
25) A weak relationship exists if the primary key of the related entity contains at least one primary key component of the parent entity.
Responda
- True
- False
Questão 26
Questão
26) You should always load data from the 1 side of a 1:M relationship.
Responda
- True
- False
Questão 27
Questão
27) A weak entity has a primary key that is partially or totally derived from the parent entity in the relationship
Responda
- True
- False
Questão 28
Questão
28. The existence of a mandatory relationship indicates that the minimum cardinality is 0 or 1 for the mandatory entity.
Responda
- True
- False
Questão 29
Questão
29) Relationships operate only in one direction.
Responda
- True
- False
Questão 30
Questão
30. A recursive relationship is one in which a relationship can exist between occurrences of the same entity set
Responda
- True
- False
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