MySQL interview question
How do NULLs behave in MySQL comparisons, indexes and unique constraints?
The answer is available to members. Create a free account to see every answer, track which questions you're confident about and practise with timed mock interviews.
More most-asked MySQL questions
- What is a clustered index in InnoDB, and why does primary key choice matter so much?
- Why is OFFSET pagination slow on large tables, and what is keyset pagination?
- How do you read EXPLAIN output in MySQL?
- Why might MySQL not use an index you created?
- What are the transaction isolation levels, and which does InnoDB use by default?
- How does a composite index work, and what is the leftmost-prefix rule?
- What causes deadlocks in MySQL, and how do you handle them?
- What are gap locks and next-key locks, and why do they surprise developers?