SQLite Interview Questions For Freshers
  1. How does SQLite differ from other relational database management systems?
  2. Can you explain the ACID properties in SQLite?
  3. What is a table in SQLite?
  4. How do you create a table in SQLite?
  5. What is a primary key in SQLite?
  6. How do you specify a primary key in a table?
  7. What is a foreign key in SQLite?
  8. How do you specify a foreign key in a table?
  9. How do you insert data into a table in SQLite?
  10. How do you update data in a table in SQLite?
  11. How do you delete data from a table in SQLite?
  12. What is a trigger in SQLite?
  13. How do you create a trigger in SQLite?
  14. What is a view in SQLite?
  15. How do you create a view in SQLite?
  16. How do you select data from a table in SQLite?
  17. What is the LIKE operator in SQLite?
  18. How do you use the LIKE operator in SQLite?
  19. What is a transaction in SQLite?
  20. How do you begin a transaction in SQLite?
  21. How do you commit a transaction in SQLite?
  22. How do you roll back a transaction in SQLite?
  23. What is indexing in SQLite?
  24. How do you create an index in SQLite?
  25. What is a schema in SQLite?
  26. How do you create a schema in SQLite?
  27. What is a constraint in SQLite?
  28. How do you add a constraint to a table in SQLite?
  29. What is the difference between a NOT NULL and a NULL constraint in SQLite?
  30. What is the difference between INTEGER and NUMERIC data types in SQLite?
  31. What is a BLOB data type in SQLite?
  32. How do you insert BLOB data into a table in SQLite?
  33. What is a trigger in SQLite?
  34. How do you write a trigger in SQLite?
  35. You have a table named "Employees" with the following columns: "ID", "Name", and "Salary". How do you add a primary key constraint to the "ID" column?
  36. You have a table named "Orders" with the following columns: "OrderID", "CustomerID", and "OrderDate". How do you add a foreign key constraint to the "CustomerID" column that references the "Customers" table?
  37. You need to insert a new row into a table named "Products". The "ProductID" column is an integer primary key, and the "ProductName" column is a string. How do you write the SQL statement to insert the new row?
  38. You have a table named "Customers" with the following columns: "CustomerID", "CustomerName", and "Country". How do you update the "Country" column for a specific customer with the "CustomerID" value of 123?
  39. You have a table named "Employees" with the following columns: "ID", "Name", and "Salary". How do you delete all rows from the table where the "Salary" column is less than 50000?
  40. You have a table named "Orders" with the following columns: "OrderID", "CustomerID", and "OrderDate". How do you write a SELECT statement to retrieve all orders placed by a specific customer with the "CustomerID" value of 123?
  41. You need to create a view named "HighSalaries" that displays the names of all employees who earn a salary of more than 75000. How do you write the SQL statement to create the view?
  42. You have a table named "Products" with the following columns: "ProductID", "ProductName", and "Price". How do you write a SELECT statement to retrieve all products whose names contain the word "apple"?
  43. You have a table named "Employees" with the following columns: "ID", "Name", and "Salary". How do you write a SELECT statement to retrieve the highest salary in the table?
  44. You have a table named "Orders" with the following columns: "OrderID", "CustomerID", and "OrderDate". How do you write a SELECT statement to retrieve the total number of orders placed by each customer?
SQLite Intermediate Interview Questions
  1. What is a subquery in SQLite?
  2. How do you write a subquery in SQLite?
  3. What is a correlated subquery in SQLite?
  4. How do you write a correlated subquery in SQLite?
  5. What is a join in SQLite?
  6. How do you perform an inner join in SQLite?
  7. How do you perform a left outer join in SQLite?
  8. How do you perform a right outer join in SQLite?
  9. How do you perform a full outer join in SQLite?
  10. What is a UNION in SQLite?
  11. How do you perform a UNION in SQLite?
  12. What is a UNION ALL in SQLite?
  13. How do you perform a UNION ALL in SQLite?
  14. What is a CTE in SQLite?
  15. How do you write a CTE in SQLite?
  16. What is the difference between a temporary table and a CTE in SQLite?
  17. What is a recursive CTE in SQLite?
  18. How do you write a recursive CTE in SQLite?
  19. What is the difference between a correlated subquery and a CTE in SQLite?
  20. What is a virtual table in SQLite?
  21. How do you create a virtual table in SQLite?
  22. What is an FTS table in SQLite?
  23. How do you create an FTS table in SQLite?
  24. What is an index on an expression in SQLite?
  25. How do you create an index on an expression in SQLite?
  26. What is a window function in SQLite?
  27. How do you use a window function in SQLite?
  28. What is the difference between the ROW_NUMBER and RANK functions in SQLite?
  29. What is a scalar subquery in SQLite?
  30. How do you write a scalar subquery in SQLite?
  31. What is a common table expression (CTE) in SQLite?
  32. How do you write a recursive CTE in SQLite?
  33. What is a table-valued function in SQLite?
  34. How do you create a table-valued function in SQLite?
  35. What is the difference between a scalar function and a table-valued function in SQLite?
  36. You have a table named "Customers" with the following columns: "CustomerID", "CustomerName", and "Country". How do you write a SELECT statement to retrieve all customers who live in either the United States or Canada?
  37. You have a table named "Orders" with the following columns: "OrderID", "CustomerID", and "OrderDate". How do you write a SELECT statement to retrieve the most recent order placed by each customer?
  38. You have a table named "Employees" with the following columns: "ID", "Name", and "Salary". How do you write a SELECT statement to retrieve the top 10 highest-paid employees?
  39. You have a table named "Products" with the following columns: "ProductID", "ProductName", and "Price". How do you write a SELECT statement to retrieve the average price of all products?
  40. You have a table named "Orders" with the following columns: "OrderID", "CustomerID", and "OrderDate". How do you write a SELECT statement to retrieve the total number of orders placed in each year?
  41. You need to create a view named "OrdersWithCustomers" that displays the "OrderID", "OrderDate", "CustomerName", and "Country" for each order. How do you write the SQL statement to create the view?
  42. You have a table named "Employees" with the following columns: "ID", "Name", and "Salary". You need to write a trigger that automatically inserts a row into a "SalaryChanges" table whenever an employee's salary is updated. How do you write the trigger?
  43. You have a table named "Customers" with the following columns: "CustomerID", "CustomerName", and "Country". You need to write a stored procedure that returns the total number of customers in each country. How do you write the stored procedure?
  44. You have a table named "Products" with the following columns: "ProductID", "ProductName", and "Price". You need to create an index on the "Price" column to improve query performance. How do you create the index?
  45. You have a table named "Orders" with the following columns: "OrderID", "CustomerID", and "OrderDate". You need to write a SELECT statement that retrieves the top 5 customers who have placed the most orders.
  46. You have a table named "Employees" with the following columns: "ID", "Name", "Department", and "Salary". You need to write a stored procedure that returns the average salary for each department. How do you write the stored procedure?
  47. You have a table named "Customers" with the following columns: "CustomerID", "CustomerName", and "Country". You need to write a SELECT statement that retrieves the top 10 countries with the most customers.
  48. You have a table named "Products" with the following columns: "ProductID", "ProductName", and "Price". You need to create a trigger that automatically updates the "Price" column to 0.00 whenever a product is discontinued. How do you write the trigger?
  49. You have a table named "Orders" with the following columns: "OrderID", "CustomerID", "OrderDate", and "TotalAmount". You need to write a SELECT statement that retrieves the top 10 orders with the highest total amount.
  50. You have a table named "Employees" with the following columns: "ID", "Name", "Department", and "Salary". You need to write a stored procedure that returns the name and salary of the highest-paid employee in each department. How do you write the stored procedure?
SQLite Interview Questions For Experienced
  1. What is the WAL mode in SQLite?
  2. How do you enable the WAL mode in SQLite?
  3. What is the difference between WAL and journal mode in SQLite?
  4. What is the role of the write-ahead log in SQLite?
  5. How does the write-ahead log affect performance in SQLite?
  6. What is a savepoint in SQLite?
  7. How do you create a savepoint in SQLite?
  8. How do you release a savepoint in SQLite?
  9. What is a multi-version concurrency control (MVCC) in SQLite?
  10. How does MVCC work in SQLite?
  11. What is the difference between pessimistic and optimistic locking in SQLite?
  12. How does SQLite handle concurrency?
  13. What is the role of the shared cache in SQLite?
  14. How do you enable the shared cache in SQLite?
  15. What is the difference between a shared cache and a private cache in SQLite?
  16. What is the page cache in SQLite?
  17. How does the page cache work in SQLite?
  18. What is the difference between the page cache and the buffer pool in SQLite?
  19. What is a collation in SQLite?
  20. How do you create a custom collation in SQLite?
  21. What is the PRAGMA statement in SQLite?
  22. How do you use the PRAGMA statement in SQLite?
  23. What is the purpose of the ANALYZE command in SQLite?
  24. How do you use the ANALYZE command in SQLite?
  25. What is the difference between the EXPLAIN and EXPLAIN QUERY PLAN commands in SQLite?
  26. What is the purpose of the VACUUM command in SQLite?
  27. How does the VACUUM command work in SQLite?
  28. What is the difference between the VACUUM and VACUUM INTO commands in SQLite?
  29. What is the purpose of the ANALYZE command in SQLite?
  30. How does the ANALYZE command work in SQLite?
  31. What is the purpose of the PRAGMA journal_mode command in SQLite?
  32. What is the purpose of the PRAGMA locking_mode command in SQLite?
  33. How does the PRAGMA cache_size command work in SQLite?
  34. What is the purpose of the PRAGMA temp_store command in SQLite?
  35. How does the PRAGMA secure_delete command work in SQLite?
  36. You have a table named "Orders" with the following columns: "OrderID", "CustomerID", "OrderDate", and "TotalAmount". You need to write a stored procedure that returns the total revenue for each month of the current year. How do you write the stored procedure?
  37. You have a table named "Customers" with the following columns: "CustomerID", "CustomerName", and "Country". You need to write a SELECT statement that retrieves the top 5 countries with the highest average order amount.
  38. You have a table named "Products" with the following columns: "ProductID", "ProductName", "Category", and "Price". You need to create a full-text search index on the "ProductName" column to improve search performance. How do you create the index?
  39. You have a table named "Orders" with the following columns: "OrderID", "CustomerID", "OrderDate", and "TotalAmount". You need to write a SELECT statement that retrieves the top 10 customers who have spent the most money.
  40. You have a table named "Employees" with the following columns: "ID", "Name", "Department", and "Salary". You need to write a stored procedure that returns the average salary for each department, but excludes the salaries of the highest-paid employee in each department. How do you write the stored procedure?
  41. You have a table named "Orders" with the following columns: "OrderID", "CustomerID", "OrderDate", and "TotalAmount". You need to create a materialized view that displays the total revenue for each month of the current year. How do you create the materialized view?
  42. You have a table named "Employees" with the following columns: "ID", "Name", "Department", and "Salary". You need to write a stored procedure that returns the name and salary of the second-highest-paid employee in each department. How do you write the stored procedure?
  43. You have a table named "Customers" with the following columns: "CustomerID", "CustomerName", and "Country". You need to write a SELECT statement that retrieves the top 5 countries with the highest total revenue, but excludes the revenue from the top 10 customers in each country.
  44. You have a table named "Products" with the following columns: "ProductID", "ProductName", "Category", and "Price". You need to write a stored procedure that returns the top 5 products in each category, based on the total sales for each product. How do you write the stored procedure?
  45. You have a table named "Orders" with the following columns: "OrderID", "CustomerID", "OrderDate", and "TotalAmount". You need to create a trigger that automatically updates the "TotalAmount" column whenever a new order is inserted into the table. The new value should be the sum of the prices of all products in the order. How do you write the trigger?
  46. You have a table named "Employees" with the following columns: "ID", "Name", "Department", and "Salary". You need to write a SELECT statement that retrieves the top 5 departments with the highest total salary.
  47. You have a table named "Customers" with the following columns: "CustomerID", "CustomerName", and "Country". You need to write a stored procedure that returns the top 5 customers in each country, based on the total amount they have spent. How do you write the stored procedure?
  48. You have a table named "Products" with the following columns: "ProductID", "ProductName", "Category", and "Price". You need to write a SELECT statement that retrieves the top 10 products with the highest total sales, but excludes the sales of the top 5 customers who have purchased each product.