Question of the Day
2026-06-11
Admission Cost Deviation per Diagnosis
FEATURED TRACK
SQL 75 – Scenario-Based Interview Prep
A premium collection of 75 high-quality, senior-level, scenario-based interview problems modeled after real interview questions from Google, Amazon, Meta, and top tech companies. Complete this track to master all SQL topics from basics to advanced window analytics!
75 Senior Problems
100% Free & Interactive
MAANG Interview Focus
Easy (8)
Medium (47)
Hard (20)
75
CURATED
Standard Practice Tracks
FAQ
Frequently Asked Questions
Quick answers about our free online SQL compiler & practice platform
Is SQL Practice completely free to use?
Yes — SQL Practice is 100% free with no sign-up required. Our free online SQL compiler lets you write, run, and test SQL queries instantly in your browser. No installation, no credit card, no account needed.
What SQL dialect does the online compiler support?
Our online SQL compiler runs SQLite for most practice sets — fully supporting SELECT, JOINs, GROUP BY, subqueries, CTEs, and window functions. The Hospital schema also supports live PostgreSQL query execution.
Are the SQL questions suitable for TCS, Infosys & Deloitte interviews?
Yes — our SQL interview questions 2026 are curated from real hiring rounds at TCS, Infosys, Deloitte, and more. Questions range from Easy (basic SELECT) to Hard (window functions, CTEs, correlated subqueries).
Can I practice SQL on different databases and schemas?
Yes! The SQL Playground lets you switch between Hospital, E-Commerce, Employees, and more schemas. It's the best way to practice SQL queries online against real-world data models.
How does the auto-grader check my SQL query?
Our built-in SQL auto-grader runs your query and compares the output against the expected result set. You instantly see ✓ correct or ✗ incorrect — plus the reference solution to learn the correct SQL syntax.