SQL 75 - SQL Practice Online

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Outlier Patient Height Search

Google Health researchers are conducting an ergonomics study and need to identify exceptionally tall patients. Write a query to retrieve the first name, last name, and height of patients whose height is strictly greater than 195 cm.
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Query Result

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Frequently Asked Questions

Everything about SQL Practice

Is SQL Practice completely free?
Yes — 100% free. No sign-up, no credit card. Open the editor and start writing SQL instantly.
What SQL dialect does the compiler use?
SQLite for most sets (covers SELECT, JOINs, CTEs, window functions). The Hospital dataset also supports PostgreSQL.
Are these real interview questions?
Yes — curated from real interview rounds at TCS, Infosys, and Deloitte (2026). Ranges from Easy basics to Hard window functions & CTEs.
How does the auto-grader work?
Your query output is compared with the expected result. A green ✓ means correct — plus you always get the reference SQL solution.
Can I try different schemas?
Yes! Use the schema selector in the header or switch to Playground mode to explore Hospital, E-Commerce, Employees and more.
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