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SQL Basics Practice

Practise SELECT, filtering, grouping and joins with fictional data. Examples use common PostgreSQL-compatible SQL. This is a knowledge practice set, not a coding assessment.

What you practise and receive

Selecting and filtering — Create a fictional orders table in a local practice database. Select specific columns, filter one status and order results by a numeric amount.
Grouping and counts — Use three North and South orders. Compare COUNT(*), COUNT(column) and grouped SUM; verify each result against the source rows.
Joins and missing data — Create two customers and one matching order. Compare an inner join with a left join and inspect the unmatched customer before adding another order.

12 original questions, three topic scores, worked explanations for every answer, a free practice guide and optional progress saved on your device. Every question has equal weight. No compulsory timer.

This original 12-question practice set describes only the sampled questions. It is not a validated proficiency level, aptitude percentile, language certificate or hiring recommendation. All examples and data are fictional. Your temporary server session and result expire after 24 hours. No name or email is requested.