Leetcode SQL 50 questions are a useful collection to learn SQL.
| No | Topic | Difficulty | Name | Solution | Concepts |
|---|---|---|---|---|---|
| 1 | Select | Easy | Recyclable and Low Fat Products | Solution | SELECT & WHERE |
| 2 | Select | Easy | Find Customer Referee | Solution | SELECT & WHERE |
| 3 | Select | Easy | Big Countries | Solution | SELECT & WHERE |
| 4 | Select | Easy | Article Views I | Solution | SELECT & WHERE & ORDER BY |
| 5 | Select | Easy | Invalid Tweets | Solution | SELECT & WHERE |
| 6 | Basic Joins | Easy | Replace Employee ID With The Unique Identifier | Solution | SELECT & LEFT JOIN |
| 7 | Basic Joins | Easy | Product Sales Analysis I | Solution | SELECT & LEFT JOIN |
| 8 | Basic Joins | Easy | Customer Who Visited but Did Not Make Any Transactions | Solution | SELECT & LEFT JOIN & GROUP BY |