SQL Quest › SQL Interview Questions › Aggregation & Grouping
Class Survival Breakdown
The maritime inquiry board needs a summary by passenger class. The passengers table gives you pclass and survived; the other four columns you build yourself with AS.
Produce exactly these 5 output columns, in this order: pclass, total (passenger count), survivors, deaths, survival_rate (percentage, rounded to exactly 1 decimal). Order by pclass.
The checker compares result values in column order — an extra column, a missing column, or an unrounded rate won't pass even if your logic is right.
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Schema
passengers
| passenger_id | survived | pclass | name | sex | age | sibsp | parch | fare | embarked |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 0 | 3 | Braund, Mr. Owen Harris | male | 22 | 1 | 0 | 7.25 | S |
| 2 | 1 | 1 | Cumings, Mrs. John Bradley | female | 38 | 1 | 0 | 71.28 | C |
| 3 | 1 | 3 | Heikkinen, Miss. Laina | female | 26 | 0 | 0 | 7.93 | S |
Expected output: 3 rows — one per class with full survival stats
Hint
Concepts
SELECT GROUP BY Aggregation
Practise the topic: SQL practice questions · GROUP BY exercises
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