<H1> SQL Interview Questions and Answers </H1> |
<H2> Table of content </H2> |
<H2> Basic SQL Interview Questions for Freshers </H2> |
<H2> Advanced SQL Interview Questions for Experienced </H2> |
<H2> SQL Interview Questions for 3 Years Experienced </H2> |
<H2> SQL Interview Questions for 5 Years Experienced </H2> |
<H2> SQL Technical Interview Questions </H2> |
<H2> SQL Scenario-Based Interview Questions </H2> |
<H2> SQL Cheat Sheets </H2> |
<H2> SQL Developer Salary on the basis of Experience </H2> |
<H2> SQL Trends in 2024 </H2> |
<H2> Job Opportunities in SQL </H2> |
<H2> Roles and Responsibilities of a SQL Developer </H2> |
<H2> Conclusion </H2> |
<H2> About the Author </H2> |
<H3> 1. What is the difference between DBMS and RDBMS? </H3> |
<H3> 2. What is Normalization and explain different types of Normalization? </H3> |
<H3> 3. What is Denormalization? </H3> |
<H3> 4. What are joins and Explain explain the different types of SQL joins </H3> |
<H3> 5. What are the subsets in SQL? </H3> |
<H3> 6. What are the applications of SQL? </H3> |
<H3> 7. Explain the different types of SQL commands. </H3> |
<H3> 8. name different operations that can be done using SQL? </H3> |
<H3> 9. What are Indexes and explain different types of indexes. </H3> |
<H3> 10. What are SQL operators? </H3> |
<H3> 11. What do you mean by data integrity? </H3> |
<H3> 12. What is a data warehouse? </H3> |
<H3> 13. How would you find the second highest salary from the following table? </H3> |
<H3> 14. Why is the FLOOR function used in SQL Server? </H3> |
<H3> 15. What do you know about CDC? </H3> |
<H3> 16. What is the difference between SQL and MySQL? </H3> |
<H3> 17. State the differences between SQL and PL/SQL </H3> |
<H3> 18. What is the ACID property in a database? </H3> |
<H3> 19. What is the need for group functions in SQL? </H3> |
<H3> 20. What do you understand about a character manipulation function? </H3> |
<H3> 21. What is AUTO_INCREMENT? </H3> |
<H3> 22. What is a “TRIGGER” in SQL? </H3> |
<H3> 23. Where are usernames and passwords stored in SQL Server? </H3> |
<H3> 24. What are the types of relationships in SQL Server databases? </H3> |
<H3> 25. How can you handle expectations in SQL Server? </H3> |
<H3> 26. Which command is used to find out the SQL Server version? </H3> |
<H3> 27. What is the COALESCE function? </H3> |
<H3> 28. What do you know about magic tables in SQL Server? </H3> |
<H3> 29. Explain Inner Join with an example. </H3> |
<H3> 30. What are the types of views in SQL? </H3> |
<H3> 31. How many authentication modes are there in SQL Server? What are they? </H3> |
<H3> 32. What is a function in SQL Server? </H3> |
<H3> 33. What is SQL Server Agent? </H3> |
<H3> 34. What are views? Give an example. </H3> |
<H3> 35. State the differences between Views and Tables. </H3> |
<H3> 36. What do you understand by Self Join? Explain using an example </H3> |
<H3> 37. What is the difference between Union and Union All operators? </H3> |
<H3> 38. Can you identify the employee who has the third-highest salary from the given employee table (with salary-related data)? </H3> |
<H3> 39. What is an effective way to prevent SQL injection in SQL Queries? </H3> |
<H3> 40. What is the significance of transactions, and how do you ensure their consistency? </H3> |
<H3> 41. How will you optimize a slow-moving SQL query? List the SQL optimization techniques? </H3> |
<H3> 42. What is wrong with the following SQL query? </H3> |
<H3> 43. What do you know about the stuff() function? </H3> |
<H3> 44. What is a stored procedure? Give an example. </H3> |
<H3> 45. What do you understand about a temporary table? Write a query to create a temporary table </H3> |
<H3> 46. What is a database cursor? How to use a database cursor? </H3> |
<H3> 47. What is the use of the INTERSECT operator? </H3> |
<H3> 48. Describe how to delete duplicate rows using a single statement but without any table creation. </H3> |
<H3> 49. Explain database white box testing and black box testing. </H3> |
<H3> 50. What is Blocking and Troubleshooting? </H3> |
<H3> 51. What is an Optimal Disk Configuration for a server? </H3> |
<H3> 52. What is a Deadlock or a live Deadlock, and how do you resolve it? </H3> |
<H3> 53. What are statistics in SQL, and how do you update them? </H3> |
<H3> 54. What is the difference between the DELETE and TRUNCATE commands? </H3> |
<H3> 55. What is the difference between the DROP and TRUNCATE commands? </H3> |
<H3> 56. What are the third-party tools that are used in SQL Server? </H3> |
<H3> 57. Can we link SQL Server with others databases? </H3> |
<H3> 58. What are some common clauses used with SELECT queries in SQL? </H3> |
<H3> 59. Explain the difference between OLTP and OLAP. </H3> |
<H3> 60. What is Hybrid OLAP? </H3> |
<H3> 61. How can you copy data from one table to another table? </H3> |
<H3> 62. What is the difference between BETWEEN and IN operators in SQL? </H3> |
<H3> 63. What is the difference between HAVING and WHERE clauses? </H3> |
<H3> 64. How can you create empty tables with the same structure as another table? </H3> |
<H3> 65. How will you update the prices in a product column by increasing 5% of the prices in each row? </H3> |
<H3> 66. How will you fetch the most recent entries in a database? </H3> |
<H3> 67. How will you calculate the average price of products in each category? </H3> |
<H3> 68. How will you calculate the total sales in each category of a product sales table? </H3> |
<H3> 69. How will you find the IDs or details where there have been no entries in terms of sales? </H3> |
<H3> 70. Suppose there is a database where information about the employees in various verticals is stored. Your task is to find the average salary of each vertical and the highest salary among the lot. </H3> |
<H3> 71. Given data where store inventory is stored, your task is to find the top 3 products in each category in terms of prices. </H3> |
<H3> 72. Write an SQL query to find the month-on-month sales of a specific product in a store. </H3> |
<H3> 73. Suppose in an organization, employees are mapped under managers. Write a SQL query that will fetch you the managers and employees working under them. </H3> |
<H3> 74. In a store inventory, your task is to fetch the total quantity of the top product purchased by the customers. </H3> |
<H3> 75. Mention different types of replication in SQL Server? </H3> |
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