PostgreSQL Subquery: Find the names and salaries of the employees who have higher salary than the employee whose last_name is Bull

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 Solution:

Code:

-- This SQL query retrieves the first name, last name, and salary of employees whose salary is greater than that of an employee with the last name 'Bull'.

SELECT first_name, -- Selects the first_name column from the employees table
       last_name, -- Selects the last_name column from the employees table
salary -- Selects the salary column from the employees table
FROM employees -- Specifies the table from which to retrieve data, in this case, the employees table
WHERE salary >  -- Filters the rows to include only those where the salary is greater than the salary of an employee with the last name 'Bull'
      (SELECT salary -- Subquery: Selects the salary of an employee with the last name 'Bull'
       FROM employees 
       WHERE last_name = 'Bull');

Explanation:

• This SQL query retrieves the first name, last name, and salary of employees whose salary is greater than that of an employee with the last name 'Bull'.
• The outer SELECT statement retrieves the first name, last name, and salary from the employees table.
• The WHERE clause filters the rows to include only those where the salary is greater than the salary obtained from the subquery.
• The subquery retrieves the salary of an employee with the last name 'Bull'.
• The subquery is enclosed in parentheses and executed before the outer query.

Sample table: employees

Output:

pg_exercises=# SELECT first_name, last_name, salary
pg_exercises-# FROM employees
pg_exercises-# WHERE salary >
pg_exercises-# (SELECT salary
pg_exercises(# FROM employees
pg_exercises(# WHERE last_name = 'Bull');
 first_name  | last_name  |  salary
-------------+------------+----------
 Alexander   | Hunold     |  9000.00
 Bruce       | Ernst      |  6000.00
 David       | Austin     |  4800.00
 Valli       | Pataballa  |  4800.00
 Diana       | Lorentz    |  4200.00
 Den         | Raphaely   | 11000.00
 Steven      | King       | 24000.00
 Neena       | Kochhar    | 17000.00
 Janette     | King       | 10000.00
 Patrick     | Sully      |  9500.00
 Allan       | McEwen     |  9000.00
 Lindsey     | Smith      |  8000.00
 Louise      | Doran      |  7500.00
 Sarath      | Sewall     |  7000.00
 Clara       | Vishney    | 10500.00
 Mattea      | Marvins    |  7200.00
 Payam       | Kaufling   |  7900.00
 Shanta      | Vollman    |  6500.00
 Kevin       | Mourgos    |  5800.00
 Ellen       | Abel       | 11000.00
 Alyssa      | Hutton     |  8800.00
 ...         | ...        |  ...
 Hermann     | Baer       | 10000.00
 Shelley     | Higgins    | 12000.00
 William     | Gietz      |  8300.00
(62 rows)

Practice Online

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