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Add answer for Quiz 2 - Data Models Quiz #21

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Add answer for Quiz 2 - Data Models Quiz #21

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4 changes: 2 additions & 2 deletions 02 - Big Data Modelling and Management Systems/Quiz 2 - Data Models Quiz.md
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Expand Up @@ -11,7 +11,7 @@
- Fixed schema of a particular database.
- A tuple that cannot be reduced.
- A column or row of data. Depends on the context.
- One unit of information that cannot be decomposed.
- **One unit of information that cannot be decomposed.**

### 3. What is the Pareto-Optimality problem?

Expand Down Expand Up @@ -59,4 +59,4 @@ Suppose we collect data month by month. Each month, we would have a batch of dat
### 9. Suppose 100 people signup for our system and of the 100 people, 60 of them did not input an address. The system lists the values as NULL for these empty entries in the address field. Would this situation still have structure for our data?

- No because the majority of data do not have a specific field filled, thus our originally defined structure is lost.
- **Yes the data has structure because we have placed a structural constraint on the data, thus the data will always have the originally defined structure.**
- **Yes the data has structure because we have placed a structural constraint on the data, thus the data will always have the originally defined structure.**