MYSQL DATABASE INTERVIEW QUESTIONS

What is the purpose of the UNION operator in MySQL?

How does UNION ALL differ from UNION in MySQL?

When would you use UNION instead of UNION ALL?

What are the requirements for the queries used in a UNION or UNION ALL operation?

Can you explain how the ORDER BY clause works with UNION?

How would you handle column name conflicts in a UNION operation?

Describe a scenario where using UNION ALL might be more appropriate than using UNION.

How can you ensure the final result set is sorted when using UNION or UNION ALL?

Explain how you would handle differing data types in columns when using UNION.

During a database certification exam, you are asked to describe a situation where using UNION would lead to a different result than using UNION ALL and explain why.