This document lists the SQL exercises. Each exercise has additional information:
- hint: for many queries, a hint is provided. Move the mouse over the text "hint" or the light bulb, if it is displayed, and the hint should pop up. Of course, the less hints you need, the better.
- difficulty: The other information shows the difficulty of the exercise (on a scale from 1 to 5). Again, move the cursor over the text "difficulty" or the tinguely machine and the difficulty rating should pop up. The more plus-signs you see, the more difficult the exercise.