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PostgreSQL Subquery - Exercises, Practice, Solution

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PostgreSQL Subquery [21 exercises with solution]

1. Write a query to find the first_name, last_name and salaries of the employees who have a higher salary than the employee whose last_name is Bull.

Sample table: employees

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2. Write a SQL subquery to find the first_name and last_name of all employees who works in the IT department.

Sample table: employees

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3. Write a SQL subquery to find the first_name and last_name of the employees under a manager who works for a department based in the United States.
.

Hint : Write single-row and multiple-row subqueries

Sample table: employees

Sample table: departments

Sample table: locations

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4. Write a SQL subquery to find the first_name and last_name of the employees who are working as a manager.

Sample table: employees

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5. Write a SQL subquery to find the first_name, last_name and salary, which is greater than the average salary of the employees.

Sample table: employees

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6. Write a SQL subquery to find the first_name, last_name and salary, which is equal to the minimum salary for this post, he/she is working on.

Sample table: employees

Sample table: jobs

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7. Write a SQL Subquery to find the first_name, last_name and salary of the employees who earn more than the average salary and works in any of the IT departments.

Sample table: employees

Sample table: departments

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8. Write a SQL subquery to find the first_name, last_name and salary of the employees who draw a more salary than the employee, which the last name is Bell.

Sample table: employees

Sample table: departments

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9. Write a SQL subquery to find all the information of the employees who draws the same salary as the minimum salary for all departments.

Sample table: employees

Sample table: departments

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10. Write a SQL subquery to find all the information of the employees whose salary greater than the average salary of all departments.

Sample table: employees

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11. Write a subquery to find the first_name, last_name, job_id and salary of the employees who draws a salary that is higher than the salary of all the Shipping Clerk (JOB_ID = 'SH_CLERK'). Sort the results on salary from the lowest to highest.

Sample table: employees

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12. Write a query to find the names (first_name, last_name) of the employees who are not supervisors.

Sample table: employees

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13. Write a SQL subquery to find the employee ID, first name, last name and department names of all employees.

Sample table: employees

Sample table: departments

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14. Write a SQL subquery to find the employee ID, first name, last name and salary of all employees whose salary is above the average salary for their departments.

Sample table: employees

Sample table: departments

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15. Write a subquery to find the 5th maximum salary of all salaries.

Sample table: employees

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16. Write a subquery to find the 4th minimum salary of all the salaries.

Sample table: employees

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17. Write a subquery to select last 10 records from a table.

Sample table: employees

Sample table: departments

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18. Write a query to list department number, the name for all the departments in which there are no employees in the department.

Sample table: employees

Sample table: departments

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19. Write a query to get three maximum salaries.

Sample table: employees

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20. Write a query to get three minimum salaries.

Sample table: employees

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21. Write a query to get nth max salaries of employees.

Sample table: employees

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... More

Structure of 'hr' database :

hr database



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