SQL skill
Advanced SQL
32 problems across 5 subtopics. Pick a subtopic to start — each climbs easy → hard.
SQL
1 easy10 medium2 hard
Pivoting & Reshaping
0 / 13 solvedStart →
SQL
2 easy2 medium1 hard
Recursive CTEs & Hierarchies
0 / 5 solvedStart →
SQL
1 easy1 medium1 hard
Funnels & Conversion
0 / 3 solvedStart →
SQL
1 easy1 medium1 hard
Cohorts & Retention
0 / 3 solvedStart →
SQL
2 easy4 medium2 hard
Sessionization & Event Sequences
0 / 8 solvedStart →