Build/Challenges

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Database Challenges

Test your skills with timed challenges. Earn XP, unlock badges, and compete on the global leaderboard. New challenges daily!

200+ challenges

Daily new challenges

50+ skill badges

Featured Challenges

daily Challenge14h 23m

Optimize the Slow Query

A production query is taking 15 seconds. Make it run in under 100ms using indexes and query restructuring.

Medium20 min342 playing150 XP

weekly Challenge3d 7h

Design a Social Media Schema

Design a normalized database schema for a social media platform with posts, comments, likes, and followers.

Hard45 min156 playing400 XP

JOIN Master

SQL

Write complex queries using INNER, LEFT, RIGHT, and FULL OUTER JOINs.

Medium15 min2.3k72%

100

Index Detective

Performance

Analyze query plans and add the right indexes to optimize performance.

Hard25 min89054%

200

Normalize This!

Schema Design

Transform a denormalized table into 3NF. Handle all edge cases.

Medium20 min1.6k68%

150

Deadlock Rescue

Troubleshooting

Identify and resolve a deadlock scenario in a banking transaction.

Expert30 min32038%

350

SQL Interview Prep: Basics

Interview Prep

10 common SQL interview questions from top tech companies.

Easy30 min4.5k85%

120

Window Functions 101

SQL

Master ROW_NUMBER, RANK, DENSE_RANK, and aggregate window functions.

Medium20 min1.9k62%

150

Query Rewrite Challenge

Performance

Rewrite inefficient queries to run 10x faster without changing results.

Hard25 min72045%

250

Connection Refused!

Troubleshooting

Debug a production database that refuses all connections.

Medium15 min1.1k71%

175

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9,450 XP33

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