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M2-UF1-A

Quiz by Miquel Carvall

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20 questions
Show answers
  • Q1
    How many primary keys should have any relational table?
    1
    n
    at least 1
    2
    30s
  • Q2
    How many foreign keys can have any relational table as a minimum?
    2
    1
    n
    0
    30s
  • Q3
    How many foreign keys can have any relational table as a maximum?
    number of attributes -1
    1
    number of attributes
    2
    30s
  • Q4
    The integrity of entity is given by the...
    DB
    FK
    PK
    DBA
    30s
  • Q5
    The referential integrity is given by the...
    FK
    DBA
    DB
    PK
    30s
  • Q6
    The behavior of a foreign key depends on...
    the DB
    its configuration
    number of its attributes
    its PK
    30s
  • Q7
    The resulting table of a binary N:M relationship has...
    2 PKs
    2 FKs
    1 FK
    2 attributes
    30s
  • Q8
    The PK coming from a weak entity, how many attributes has as a minimum?
    1
    n
    2
    it depends
    30s
  • Q9
    A candidate key can have subsets being candidate keys?
    Yes if it is FK
    No
    Yes if it is PK
    Yes
    30s
  • Q10
    The table derived from a reflexive entity always receives attributes
    No
    Yes
    Yes, the FKs
    Yes, the PK
    30s
  • Q11
    If you have 4 candidate keys, how many PKs can you have?
    2
    1
    4
    3
    30s
  • Q12
    If you have 4 candidate keys, how many AKs will you have?
    4
    3
    2
    1
    30s
  • Q13
    Can you think of an overlapped specialization as being an exclusive relationship?
    Yes, sometimes
    No, most of the times
    No, never
    Yes, always
    30s
  • Q14
    Can you think of a disjoint specialization as being an exclusive relationship?
    No, never
    Yes, always
    Yes, sometimes
    No, most of the times
    30s
  • Q15
    A table that fulfills 1NF and has no attributes outside the key
    has no FKs
    doesn't fulfill 2NF
    can fulfill 2NF
    sure fulfills 2NF
    30s

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