SQL & Relational Databases
The SQL every data, backend and analyst interview tests — filtering, joins, aggregation, window functions and design.
SQL is the most requested skill across data analyst, data engineer, backend and BI job listings. This assessment checks that you can predict what a query returns and choose the right construct: NULL behaviour, every join type, GROUP BY and HAVING, subqueries, CTEs and window functions, plus the keys, normalisation, indexes and transactions behind a sound schema.
What it measures
Querying & Filtering
SELECT, WHERE, NULL logic, DISTINCT, ordering and logical query order.
Joins
Inner, left, cross and anti-joins, and where join conditions belong.
Aggregation & Grouping
COUNT/SUM/AVG semantics, GROUP BY and HAVING.
Subqueries & Window Functions
Correlated subqueries, CTEs, ranking and running totals.
Design & Integrity
Keys, normalisation, indexes and ACID transactions.
Who it's for
- Aspiring data analysts, BI developers and data engineers
- Backend developers who write queries daily
- Graduates preparing for SQL interview rounds
How the test works
- 20 questions drawn at random from a larger bank, balanced across every skill area above.
- Answer options are shuffled for each candidate, and the timer keeps running once you start.
- Your answers save automatically. If your connection drops, reopen your link to continue.
- Score 70% or more to earn a verifiable ARISE certificate. You get 2 attempts.
Try a sample question
Table t has x values 1, 2 and NULL. What does this return?
SELECT COUNT(x) FROM t;
FAQ