SQL Exercise: List the employees who joined before 1991

Last update on December 20 2024 11:40:06 (UTC/GMT +8 hours)

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12. From the following table, write a SQL query to find those employees who joined before 1991. Return complete information about the employees.

Sample table: employees

Pictorial Presentation:

Sample Solution:

SELECT *
FROM employees
WHERE hire_date<('1991-1-1');

Sample Output:

 emp_id | emp_name | job_name | manager_id | hire_date  | salary | commission | dep_id
--------+----------+----------+------------+------------+--------+------------+--------
  63679 | SANDRINE | CLERK    |      69062 | 1990-12-18 | 900.00 |            |   2001
(1 row)

Explanation:

The said query in SQL that selects all columns from the 'employees' table where the hire_date is before January 1, 1991.

The "WHERE" clause filters the results for all employees whose hire date is earlier than January 1, 1991.

Relational Algebra Expression:

Relational Algebra Tree:

Practice Online

Sample Database: employee

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