← Practice
SQL skill

Summarising Data

23 problems across 3 subtopics. Pick a subtopic to start — each climbs easy → hard.

SQL
8 easy6 medium1 hard

Aggregation & GROUP BY

0 / 15 solvedStart →
SQL
1 easy1 medium1 hard

Conditional Logic & CASE

0 / 3 solvedStart →
SQL
1 easy3 medium1 hard

Conditional Aggregation

0 / 5 solvedStart →