mirror of
https://github.com/robindhole/fundamentals.git
synced 2025-03-16 15:20:05 +00:00
32 lines
1.3 KiB
Markdown
32 lines
1.3 KiB
Markdown
# 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
|
|
---
|
|
2. 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
|
|
---
|
|
3. 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)
|
|
---
|
|
4. 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` |