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SQL aggregation and filtering problems similar to this one are common in data-related interview rounds at large tech companies. Practicing queries involving GROUP BY, HAVING, and multi-condition filtering can help prepare for those scenarios.
The optimal approach typically uses SQL aggregation with GROUP BY and HAVING clauses. By counting how many required conditions or skills each candidate satisfies, you can filter only those who meet all criteria efficiently.
Key SQL concepts include GROUP BY, HAVING, joins, and conditional filtering. These help combine candidate data with their attributes and verify whether each candidate satisfies the full set of requirements.
In SQL problems like this, aggregation and relational joins are the main techniques. Proper indexing on candidate identifiers and skill columns can significantly improve query performance.