Most Popular SQL Interview Questions and Answers

Land a job by refreshing your mind with these SQL Interview Questions and Answers. I’ve collected the best video tutorials that will help you handle popular and basic to tricky SQL interview questions. Good luck and let’s get started!

200+ SQL Interview Questions

The first on our list is the 200+ SQL Interview Questions by Amarnath Reddy. This course will help you prepare to any SQL Developer Interview by providing more than 200 of the most common real world SQL questions and providing practical answers.

Course Highlights

  • Includes SQL interview questions for Junior Developers
  • Includes SQL interview questions for Mid/Senior Developers
  • Includes SQL interview questions for Junior Developers
  • Focus on interview questions and answer

I strongly suggest this course if you want to have a quick overview and refresh your previous knowledge with database and SQL. In 2.5 hours, you will get the secret answers and analyze each topic to have better understanding. Click the button below to get stared.

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SQL Tricky Interview Questions Preparation Course

What I really like with this video tutorial is they unlocked the most tricky and nasty interview questions on SQL that is being asked during interviews on some of the most popular companies like Ebay, Amazon, Google, etc. The author made a compilation of these questions and provide ways on how to answer them.

Course Highlights

  • Answers popular SQL interview questions
  • Focus on important concepts of SQL
  • Interview questions for Fresher to Architect level
  • Provide most common and lated SQL interview questions

To give you an overview, here are some of the questions.

  1. Write SQL query to get the second highest salary among all Employees? [View Answers]
  2. How can we retrieve alternate records from a table in Oracle? [View Answers]
  3. Write a SQL Query to find Max salary and Department name from each department. [View Answers]
  4. Write a SQL query to find records in Table A that are not in Table B without using NOT IN operator. [View Answers]
  5. What is the result of following query? [View Answers]
  6. Write SQL Query to find employees that have same name and email. [View Answers]
  7. Write a SQL Query to find Max salary from each department. [View Answers]
  8. Write SQL query to get the nth highest salary among all Employees. [View Answers]
  9. How can you find 10 employees with Odd number as Employee ID? [View Answers]
  10. Write a SQL Query to get the names of employees whose date of birth is between 01/01/1990 to 31/12/2000. [View Answers]
  11. Write a SQL Query to get the Quarter from date. [View Answers]
  12. Write Query to find employees with duplicate email. [View Answers]
  13. Is it safe to use ROWID to locate a record in Oracle SQL queries? [View Answers]
  14. What is a Pseudocolumn? [View Answers]
  15. What are the reasons for de-normalizing the data? [View Answers]
  16. What is the feature in SQL for writing If/Else statements? [View Answers]
  17. What is the difference between DELETE and TRUNCATE in SQL? [View Answers]
  18. What is the difference between DDL and DML commands in SQL? [View Answers]
  19. Why do we use Escape characters in SQL queries? [View Answers]
  20. What is the difference between Primary key and Unique key in SQL? [View Answers]
  21. What is the difference between INNER join and OUTER join in SQL? [View Answers]
  22. What is the difference between Left OUTER Join and Right OUTER Join? [View Answers]
  23. What is the datatype of ROWID? [View Answers]
  24. What is the difference between where clause and having clause? [View Answers]
  25. What is cardinality in SQL? [View Answers]
  26. What is Merge statement in SQL? [View Answers]
  27. What is the difference between UNION and UNION ALL? [View Answers]
  28. What will be the result of following query? [View Answers]
  29. What is the wrong with this SQL query? [View Answers]
  30. What is wrong with this query to get the list of employees not in Dept 1? [View Answers]
  31. What is the use of Execution plan in SQL? [View Answers]
  32. How many records are returned by following query? [View Answers]
  33. Write a query for this problem? [View Answers]
  34. Write SQL Query to get Employee Name, Manager ID and number of employees in the department? [View Answers]
  35. Write SQL Query to find duplicate rows in a database? [View Answers]
  36. Write SQL query to delete duplicate rows in a table? [View Answers]
  37. Why is the difference between NVL and NVL2 functions in SQL? [View Answers]
  38. What are ACID properties in a SQL transaction? [View Answers]
  39. What is the main difference between RANK and DENSE_RANK functions in Oracle? [View Answers]
  40. What is the use of WITH clause in SQL? [View Answers]
  41. Which SQL feature can be used to view data in a table sequentially? [View Answers]
  42. Write SQL Query to get Student Name and number of Students in same grade. [View Answers]
  43. Write SQL Query to get the list of grades with total score more than average score. [View Answers]
  44. What are the differences between CASE and DECODE in SQL? [View Answers]
  45. Write a Query to get Unique names of products without using DISTINCT keyword. [View Answers]
  46. Write a SQL query to maximum Zipcode from a table without using MAX or MIN aggregate functions. [View Answers]
  47. Given a list of student names and grade. Write a query to print a comma separated list of student names in a grade. [View Answers]
  48. What is the difference between Correlated and Un-correlated Sub query? [View Answers]
  49. Given an Employee table with Manager_ID as column, print First name, Manager ID and Level of employees in Organization Structure? [View Answers]
  50. Write a query to create an empty table from an existing table? [View Answers]
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The Advance SQL course with Interview Questions

If you have previous knowledge in SQL and want to go to the next level, you can take this advance course. What I like about this course is you hit 3 birds with one stone. Aside from learning some advanced concepts in database management, you will also get various practice exercises and SQL interview questions. Although it’s an advance lesson, anyone with no background knowledge in database can enroll to this course.

Course Highlights

  • Learn the basic SQL syntax
  • Solve various MCQ’s
  • Good course to practice skills in SQL – The author include exercises, challenges and opportunities
  • Great tips and answers to SQL interview questions

At the end of the course, you will learn how to use SQL database and queries to build your own web applications. To learn more about this course, watch the free vide preview by clicking the button below.

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