Master SQL interviews with AI. Practice queries, joins, window functions, aggregations, and database design for data analyst, data engineer, and backend developer positions.
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Questions vary by role and seniority
Comprehensive SQL interview preparation
INNER, LEFT, RIGHT, FULL
ROW_NUMBER, RANK, LAG
GROUP BY, HAVING
CTEs, correlated
Indexes, execution plans
Normalization, keys
ACID, isolation levels
Performance tips
Database interview simulation
JOINs
All types mastered
Window Functions
Advanced analytics
Subqueries
CTEs, correlated
Aggregations
GROUP BY, HAVING
Optimization
Index strategies
Schema Design
Normalization
Transactions
ACID properties
Performance
Execution plans
Practice these and more
Write a query to find customers who have placed orders but never received a refund. Use the customers, orders, and refunds tables.
For each department, find the employee with the second highest salary. Use window functions.
Calculate the running total of sales by month, and the month-over-month growth rate.
This query is running slowly. Analyze the execution plan and suggest optimizations: [complex query provided]
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