SQL INTERVIEW QUESTIONS FOR EXPERIENCED PROFESSIONALS ( Vestino Technologies)

SQL INTERVIEW QUESTIONS FOR EXPERIENCED PROFESSIONALS ( Vestino Technologies)

1. What is SQL injection? 2. What is a trigger in SQL? 3. How to insert multiple rows in SQL? 4. How to find the nth highest salary in SQL? 5. How to copy table in SQL? 6. How to add a new column in SQL? 7. How to use LIKE in SQL? 8. If we drop a...

  1. What is SQL injection?
  2. What is a trigger in SQL?
  3. How to insert multiple rows in SQL?
  4.  How to find the nth highest salary in SQL?
  5. How to copy table in SQL?
  6. How to add a new column in SQL?
  7. How to use LIKE in SQL?
  8. If we drop a table, does it also drop related objects like constraints, indexes, columns, default, views and sorted procedures?
  9. Can we disable a trigger? If yes, How?
  10. What is a Live Lock?
  11. How to fetch alternate records from a table?
  12. Define COMMIT and give an example?
  13. Can you join table by itself? 
  14. Explain Equi join with example
  15. How do we avoid getting duplicate entries in a query?
  16. How can you create an empty table from an existing table?
  17. Write a Query to display odd records from student table?
  18. Explain Non Equi Join with example?
  19. How can you delete duplicate records in a table with no primary key?
  20. Difference between NVL and NVL2 functions?
  21. What is the difference between clustered and non-clustered indexes?
  22. What does this query says? GRANT privilege_name ON object_name TO {user_name|PUBLIC|role_name} [WITH GRANT OPTION];
  23. Where MyISAM table is stored?
  24. What does myisamchk do?
  25. What is ISAM?
  26. What is Database White box testing?
  27. What are the different types of SQL sandbox?
  28. What is Database Black Box Testing? This testing involves 1. Data Mapping 2. Data stored and retrieved 3. Use of Black Box testing techniques such as Equivalence Partitioning and Boundary Value Analysis (BVA).
  29. Explain Right Outer Join with Example?
  30. What is a Subquery? ADVANCED QUESTIONS
  31. What are the different types of Collation Sensitivity?
  32. Write a query to find out the data between range?
  33. How to calculate the number of rows in a table without using the count function?
  34. What is wrong with the following query? SELECT empName FROM employee WHERE salary <> 6000
  35. Will the following statements execute? if yes what will be output? SELECT NULL+1 SELECT NULL+’1′
  36. SQL vs. PL/SQL
  37. SQL having vs where
  38. When to use NoSQL vs SQL
  39. SQL vs TSQL
  40. MySQL vs SQL Server
  41. MongoDB vs SQL

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