Common Table Expression ( CTE ) Interview Questions and Answers

Common Table Expression ( CTE ) Interview Questions and Answers

Below are the most common interview questions based on the Common Table Expression(CTE):

Q01. What is Common Table Expression and which version of SQL supports the Common Table Expression?

Q02. What is the difference between Common Table Expression and Derived Table and SubQuery?

Q03. Is Nested CTE and Recursive CTE allowed in SQL?

Q04. Can you use the CTE without the alias name?

Q05. Can you JOIN a table with the CTE?

Q06. Can you use a CTE in the WHERE clause?

Q07. Are duplicate column names allowed in the CTE?

Q08. Is an anonymous column name or column with no name is allowed in the CTE?

Q09. Can you filter the record by applying the ORDER BY clause in the CTE?

Q10. Can you DELETE the records from the CTE? Does it also affect the actual underlying base table?

Q11. Can you UPDATE the records from the CTE? Does it also affect the actual underlying base table?

Q12. Can you INSERT the records from the CTE? Does it also affect the actual underlying base table?

Q13. Can you TRUNCATE the records from the CTE? Does it also affect the actual underlying base table?

Q14. What is the most common use of the CTE in SQL?

Q15. What is Table Value Constructor in SQL and how can you create it using CTE?

Q16. Can you specify the data types along with the column names in the CTE?

Q17. Can a CTE contain outer query references in MS SQL?

Q18. How can you get the third-highest salary using the CTE?

Q19. How can you check and remove the duplicate records using the CTE?

Q20. How can you apply multi-level aggregations in SQL?

Q21. How can you do data pagination in SQL?

Q22. What is Recursive CTE and what is the maximum level of the default recursion?

Q23. Does CTE use Temp DB internally?

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