GATE DA 2025 Set 1 — Question 46
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Database Management & Warehousing → Data Warehousing → Filtering, Grouping & Nested Queries
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Question
Consider a fact table in an OLAP application:
Facts(D1, D2, val), where D1 and D2 are its dimension attributes and val is a dependent attribute. Suppose attribute D1 takes 3 values and D2 takes 2 values, and all combinations of these values are present in the table Facts. How many tuples are there in the result of the following query?SELECT D1, D2, sum(val)
FROM Facts
GROUP BY CUBE (D1, D2);
Correct answer
(D) 12
Solution
The
CUBE (D1, D2) operation generates grouping sets for all possible combinations of the specified dimensions. For two dimensions and , the grouping sets are:1.: Aggregation for each unique combination of and . Since all combinations are present, there are tuples.
2.: Aggregation for each unique value of (subtotals). There are tuples.
3.: Aggregation for each unique value of (subtotals). There are tuples.
4.: Grand total. There is tuple.
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