MSSQL DATABASE INTERVIEW QUESTIONS

What is the difference between UNION and UNION ALL in MSSQL?

How do you use the UNION operator in MSSQL?

How do you use the UNION ALL operator in MSSQL?

What are the performance implications of using UNION vs. UNION ALL in MSSQL?

Can you combine more than two result sets using UNION or UNION ALL in MSSQL? Provide an example.

How do you order the combined result set when using UNION or UNION ALL in MSSQL?

How do you handle columns with different names when using UNION or UNION ALL in MSSQL?

. How do you ensure data type compatibility when using UNION or UNION ALL in MSSQL?

How do you use UNION or UNION ALL with WHERE clauses in MSSQL?

Explain a scenario where using UNION or UNION ALL is crucial for a business application in MSSQL and describe how you would implement it.