Practice SQL.Think like a Data Engineer.
Solve practical SQL interview problems with an interactive playground, realistic datasets, instant feedback and progress tracking.
Start with the free questions — no account required for practice.
SQL Practice
Your interview workspace
COUNT(*) AS order_count
FROM orders
GROUP BY customer_id;
10
Free
8
Skill Areas
SQL
Playground
Choose a track
SQL skills that matter in interviews
Start with the 10 free questions or explore the premium tracks planned for the complete SQL interview library.
SQL Fundamentals
BeginnerFreeSELECT, WHERE, ORDER BY, GROUP BY and core SQL concepts.
Joins & Aggregations
Beginner → IntermediateFreeINNER JOIN, LEFT JOIN, GROUP BY and practical interview problems.
Subqueries & CTEs
IntermediateFreeBuild reusable SQL logic with subqueries and CTEs.
Window Functions
Intermediate → AdvancedPremiumROW_NUMBER, RANK, LAG, LEAD and analytical SQL.
Advanced SQL
AdvancedPremiumSolve challenging SQL problems with realistic datasets.
Data Engineering SQL
AdvancedPremiumIncremental loads, watermarks, deduplication and ETL scenarios.
Performance Optimization
AdvancedPremiumQuery optimization, indexing concepts and efficient SQL.
Real Interview Scenarios
InterviewPremiumPractical problems similar to Data Engineer interviews.
Practice workflow
A simple interview practice loop
01
Read
Understand the requirement.
02
Inspect
Review the dataset.
03
Write
Build your SQL.
04
Check
Run and validate.
05
Improve
Review and repeat.
Built for interview prep
More than a question list
Practice, get feedback and build a repeatable SQL interview routine.
Interactive SQL Playground
Write and execute SQL safely in the browser.
Instant Feedback
Check your query against the expected result.
Progress Tracking
Track completed questions, accuracy and attempts.
Review Mistakes
Return to incorrect questions and retry them.
Practice access
Start free. Go deeper when you're ready.
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Start with the free SQL questions and solve your first interview problem in the browser playground.
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