Question

Given the table facts: \[ \text{facts (D1, D2, val)} \] with the following data: 

 Consider the following SQL query: 

 What is the total number of rows produced?

• A. 12
• B. 9
• C. 8
• D. 6

Hint:

The `CUBE` function generates all possible groupings, including individual attributes, their combinations, and a total aggregation.

Answer 1

The Correct Option is C

The `CUBE(D1, D2)` operation generates all possible groupings for the attributes \(D1\) and \(D2\), including their combinations with aggregate values. The formula for the number of rows in a cube operation is: \[ \text{Total Rows} = (n_1 + 1) \times (n_2 + 1) \] where: - \( n_1 \) is the number of unique values in \( D1 \) (which is 3: {1,2,3}). - \( n_2 \) is the number of unique values in \( D2 \) (which is 2: {x,y}). \[ (3+1) \times (2+1) = 4 \times 3 = 12 \] Thus, the total number of rows produced by this query is 12. Conclusion: Using the cube operation, we generate all groupings of \( D1 \) and \( D2 \) along with their aggregates, resulting in 12 rows.