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fundamentals/database/mcqs/02-integrity-er-diagram.md
Tanmay 7f3252f436 Adds MCQs.
2022-07-18 12:57:23 +01:00

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Questions

  1. Joe Bloggs is helping us build Scaler. He is trying to delete some batches but the database throws an error that the batch is used by a tuple in another table. Which type of integrity constraint is being enforced here?

    A. User-defined integrity
    B. Domain integrity
    C. Entity integrity
    D. Referential integrity

  1. Which of the following is not an example of domain integrity constraints?

    A. Validating that input is correct data type
    B. Ensuring value is not null if a non-nullable column
    C. Making sure each row is unique
    D. Checking if the value exceeds maximum length

  1. Joe Bloggs is taking some time off to build his house. A house can have many rooms. What is the cardinality of house to room?

    A. One to Many (1:m)
    B. One to One (1:1)
    C. Many to Many (m:n)

  1. Let us say a house has a house_id and a room has room_id. Given the cardinality of house to room, which is the ideal place to store their relationship i.e. reference?

    A. room_id in house
    B. Separate table for room_id and house_id
    C. Array of room_ids in house
    D. house_id in room

Answers

  1. D. Referential integrity
  2. C Making sure each row is unique
  3. A One to Many (1:m)
  4. D house_id in room