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SQL skill

Combining Data

36 problems across 4 subtopics. Pick a subtopic to start — each climbs easy → hard.

SQL
4 easy4 medium4 hard

Joins

0 / 12 solvedStart →
SQL
2 easy3 medium1 hard

EXISTS & Anti-Joins

0 / 6 solvedStart →
SQL
3 easy6 medium3 hard

Set Operations

0 / 12 solvedStart →
SQL
1 easy2 medium3 hard

Subqueries & CTEs

0 / 6 solvedStart →