SQL Interview Questions

Interviews for IT jobs including SQL jobs often include challenges far beyond the usual questions regarding career aspirations. IT job interviews often consist of brainteasers and practical questions designed to measure your logic, reasoning, creative thinking, and problem-solving skills. The objective for the interviewer is not only to assess your technical knowledge, but also your communication skills and suitability (culturally) for the company.

Here are some example SQL interview questions to help you to prepare yourself (answers can be found at the bottom of the page):

SQL interview questions

1. What is the difference between a "where" clause and a "having" clause?
2. What is the basic form of a SQL statement to read data out of a table?
3. What structure can you implement for the database to speed up table reads?
4. What are the tradeoffs with having indexes?
5. What is "normalization"? "Denormalization"? Why do you sometimes want to denormalize?
6. What is a "constraint"?
7. What types of index data structures can you have?
8. What is a "primary key"?
9. What is a "functional dependency"? How does it relate to database table design?
10. What is a "trigger"?

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It is important at SQL jobs interviews to be specific when answering questions. Concise qualitative answers demonstrate confidence and knowledge.

For more advice on perfecting your interview technique, we've partnered up with CV Knowhow who offer interview coaching so click here to find out more.

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Good Luck!

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