Tests · Backend and databases
Backend and databases
PHP, Laravel, SQL, API design, queues and caching — what decides whether a site survives its second thousand customers.
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2
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Tests in this topic
3 tests at the “Easy” level. Clear the filter to see the whole topic.
Updated August 9, 2026Easy
PHP Basics
- Questions in the test
- 5 questions
- Time limit
- 10 min
Updated August 9, 2026Easy
PHP 8 basics
Eight questions about what you meet in your first month of PHP: strict_types, == versus ===, array functions, the ?? operator, arrow functions, named arguments, constructor property promotion and enums. For juniors and for anyone coming back to PHP after a break.
- Questions in the test
- 8 questions
- Time limit
- 8 min
Updated August 9, 2026Easy
SQL: queries and joins
Eight questions on basic SQL: WHERE and ORDER BY, the difference between INNER and LEFT JOIN, GROUP BY with aggregates, HAVING, NULL and DISTINCT. For anyone already writing simple queries who wants to check the fundamentals.
- Questions in the test
- 8 questions
- Time limit
- 8 min