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I really like this one. I converted it to MS SQL. My original solution was very inefficient, with subqueries in where and having clauses. Reviewing this solution and understanding how it works definitely improved my understanding of SQL.
15 Days of Learning SQL
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I really like this one. I converted it to MS SQL. My original solution was very inefficient, with subqueries in where and having clauses. Reviewing this solution and understanding how it works definitely improved my understanding of SQL.