SQL Exercise: List the employees who joined before 1 April 1991

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25. From the following table, write a SQL query to find those employees who joined before 1st April 1991. Return employee ID, employee name, hire date and salary.

Sample table: employees

Pictorial Presentation:

Sample Solution:

SELECT e.emp_id,
       e.emp_name,
       e.hire_date,
       e.salary
FROM employees e
WHERE hire_date <'1991-04-01';

Sample Output:

 emp_id | emp_name | hire_date  | salary
--------+----------+------------+---------
  63679 | SANDRINE | 1990-12-18 |  900.00
  64989 | ADELYN   | 1991-02-20 | 1700.00
  65271 | WADE     | 1991-02-22 | 1350.00
(3 rows)

Explanation:

The said query in SQL that returns a list of all employees who were hired before April 1st, 1991, along with their ID, name, hire date, and salary from the 'employees' table.

The WHERE clause filters the results to include only those employees who were hired before April 1st, 1991.

Relational Algebra Expression:

Relational Algebra Tree:

Practice Online

Sample Database: employee

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