علم البيانات | DS2 Quizes – Telegram
علم البيانات | DS2 Quizes
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"قناة علمية متخصصة في مجال علم البيانات، قناة خاصة بالاختبارات MCQ ."
القناة العامة: @Computer_DS_1
النقاشات: @Computer_DS1
قناة الاختبارات: @Computer_DS_2
بوت التواصل والمشاركات : @DS_Combot
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Which of the following concepts is considered a top-down process, breaking an entity into more specific types?
Anonymous Quiz
54%
Specialization
23%
Generalization
15%
Categorization
8%
Aggregation
If an entity type can have two or more distinct key attributes, they are called:
Anonymous Quiz
0%
Alternate Keys
62%
Candidate Keys
15%
Foreign Keys
23%
Partial Keys
The category construct is mainly used to represent:
Anonymous Quiz
23%
Multiple inheritance
23%
Disjoint specialization
38%
Union types
15%
Generalization lattices
The process of defining subclasses to represent distinctions among entities in the Superclass is:
Anonymous Quiz
42%
Generalization
42%
Specialization
0%
Union Type
17%
Aggregation
Which type of specialization is explicitly decided by the user when entering the data, rather than being determined by an attribute value?
Anonymous Quiz
25%
Attribute-Defined Specialization
33%
Total Specialization
42%
User-Defined Specialization
0%
Overlapping Specialization
The combination of constraints (Overlapping, Partial) means that an entity may belong to:
Anonymous Quiz
17%
Exactly one subclass
25%
All defined subclasses
50%
Zero or more subclasses
8%
At least one subclass
The Superclass/Subclass relationship where entities of the Superclass have only the possibility of being in the Subclass is:
Anonymous Quiz
23%
Total Specialization
8%
Partial Specialization
46%
Attribute-Defined Specialization
23%
Disjoint Specialization
The formal term for a Row in the Relational Model is:
Anonymous Quiz
31%
Domain
56%
Tuple
13%
Relation
0%
Attribute
The number of Attributes in a relation is referred to as its:
Anonymous Quiz
19%
Domain
19%
Cardinality
56%
Degree
6%
State
The integrity constraint that specifies that the Primary Key cannot have a NULL value is the:
Anonymous Quiz
7%
Domain Constraint
21%
Entity Integrity Constraint
43%
Referential Integrity Constraint
29%
Key Constraint
The constraint that ensures that a value of an attribute in one relation must exist as a value of a primary key in another relation is:
Anonymous Quiz
14%
Key Constraint
29%
Entity Integrity Constraint
57%
Referential Integrity Constraint
0%
Domain Constraint
A minimal superkey is also referred to as a:
Anonymous Quiz
29%
Alternate Key
50%
Candidate Key
14%
Foreign Key
7%
Primary Key
Which term refers to a Candidate Key that was not chosen as the Primary Key?
Anonymous Quiz
14%
Alternate Key
21%
Partial Key
64%
Superkey
0%
Foreign Key
The set of allowed values for an attribute is defined by its:
Anonymous Quiz
43%
Domain
14%
Cardinality
36%
Degree
7%
Relation
Which characteristic of a relation states that the ordering of tuples (rows) has no significance?
Anonymous Quiz
29%
The degree is fixed
21%
Tuple ordering is immaterial
29%
Domain constraints must be met
21%
Tuple values are atomic
The set of tuples of a relation at any specific point in time is called the:
Anonymous Quiz
8%
Relation Degree
31%
Relation State
31%
Relation Domain
31%
Relation Schema
Which update operation may violate the Referential Integrity constraint?
Anonymous Quiz
58%
Update or Delete
17%
Insert
17%
Create
8%
Select