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Querying Relational Databases

  • Unique Keys 2:06
  • Primary Keys 1:59
  • Database Keys Review 4 questions
  • Foreign Keys 4:36
  • Foreign Keys Review 5 questions

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You have completed Database Keys Review!

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Quiz Question 1 of 4

What happens when a Unique Constraint is violated in a database system?

Choose the correct answer below:

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  • A
    The database allows the data to be written anyway.
  • B
    The database does not allow the data to be written to the table and an error is returned.
  • C
    The database locks up until the Database Administrator does a reboot.
  • D
    An email alert is sent to the Database Administrator.
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