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Keys and Constraints in MySQL Cognitive Class Exam Answers:-

Course Name:- Keys and Constraints in MySQL

Keys and Constraints in MySQL Cognitive Class Final Exam Answers:-

Question 1. What can you use a primary key in a table for?

  • Enforce uniqueness of table rows
  • Define rows in the table
  • Define columns in the table
  • None of the above statements

Quesstion 2.  In MySQL database, which feature enables a unique number to be generated automatically when a new record is inserted into a table?

  • Identity feature
  • Auto-increment feature
  • Both of the mentioned features
  • None of the above

Question 3. What do you create that automatically creates an index?

  • Primary key
  • Table
  • Foreign key
  • None of the above

Question 4. You created a new table in your MySQL database and later decide that you want to ensure that one of the fields always contains a value. What should you do?

  • Turn on the Primary key option for the field.
  • Turn off the NULL option for the field.
  • There is no need to change anything in your table definition to make this happen.
  • None of the above.

Question 5. When comparing primary keys to foreign keys, which of the following statements only describe foreign keys?

  • Are related to a unique primary key.
  • Are always indexed.
  • Must be unique within the table.
  • None of the above

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