1. Revising the SELECT Query I (Easy)
2. Revising the SELECT Query II (Easy)
3. SELECT All (Easy)
4. SELECT by ID (Easy)
5. Japanese Cities’ Attributes (Easy)
6. Japanese Cities’ Names (Easy)
7. Average Population (Easy)
8. Japan Population (Easy)
9. Revising Aggregations - The COUNT Function (Easy)
10. Revising Aggregations - The SUM Function (Easy)
11. Revising Aggregations - Averages (Easy)
12. Population Density Difference (Easy)
13. African Cities (Easy)
14. Population Census (Easy)
15. Average Population of Each Continent (Easy)
16. Weather Observation Station 1 (Easy)
17. Weather Observation Station 2 (Easy)
18. Weather Observation Station 3 (Easy)
19. Weather Observation Station 4 (Easy)
20. Weather Observation Station 5 (Easy)
21. Weather Observation Station 6 (Easy)
22. Weather Observation Station 7 (Easy)
23. Weather Observation Station 8 (Easy)
24. Weather Observation Station 9 (Easy)
25. Weather Observation Station 10 (Easy)
26. Weather Observation Station 11 (Easy)
27. Weather Observation Station 12 (Easy)
28. Weather Observation Station 13 (Easy)
29. Weather Observation Station 14 (Easy)
30. Weather Observation Station 15 (Easy)
31. Weather Observation Station 16 (Easy)
32. Weather Observation Station 17 (Easy)
33. Weather Observation Station 18 (Medium)
34. Weather Observation Station 19 (Medium)
35. Weather Observation Station 20 (Medium)
36. Higher than 75 Marks (Easy)
37. Employee Names (Easy)
38. Employee Salaries (Easy)
39. Top Earners (Easy)
40. The Blunder (Easy)
41. Type of Triangle (Easy)
42. The PADS (Medium)
43. The Report (Medium)
44. Top Competitors (Medium)
45. Challenges (Medium)
46. Contest Leaderboard (Medium)
47. 15 Days of Learning SQL (Hard)

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