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Open SQL (Intermediate)

Practice complex SELECT statements including joins, GROUP BY, HAVING, subqueries, and performance-aware SQL usage.

INNER and LEFT OUTER JOIN

MediumNew

Fetch data using multi-table joins.

GROUP BY and HAVING

MediumNew

Filter aggregated results using GROUP BY and HAVING.

Subqueries and EXISTS

HardNew

Use subqueries for advanced filtering logic.