Advent Of Code 2021 SQL Day 1 ✅ Day 2 ✅ Day 3 ❌ Day 4 ❌ Day 5 ❌ Day 6 ❌ Day 7 ❌ Day 8 ❌ Day 9 ❌ Day 10 ❌ Day 11 ❌ Day 12 ❌ Day 13 ❌ Day 14 ❌ Day 15 ❌ Day 16 ❌ Day 17 ❌ Day 18 ❌ Day 19 ❌ Day 20 ❌ Day 21 ❌ Day 22 ❌ Day 23 ❌ Day 24 ❌ Day 25 ❌