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Quick Summary

Identify entities that possess every item in a predefined set.
Requires narrowing down rows to only relevant attributes before aggregating.
Uses grouped counts to verify exact membership in the target set.

What This Tests

Combining conditional filtering with aggregation
Relational division and set matching logic
Handling normalized one-to-many schemas without explicit primary keys
Distinguishing between WHERE and HAVING clause purposes

Common Patterns

Aggregation

HAVING Filter

Groupby

Sort

Test Cases

Input

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Output

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Expected

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