SQL Exercise: List the managers of department 1001 or 2001

Last update on December 20 2024 11:40:25 (UTC/GMT +8 hours)

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49. From the following table, write a SQL query to find those managers who are in the department 1001 or 2001. Return complete information about the employees.

Sample table: employees

Pictorial Presentation:

Sample Solution:

SELECT *
FROM employees
WHERE job_name = 'MANAGER'
  AND (dep_id = 1001
       OR dep_id =2001);

Sample Output:

 emp_id | emp_name | job_name | manager_id | hire_date  | salary  | commission | dep_id
--------+----------+----------+------------+------------+---------+------------+--------
  67832 | CLARE    | MANAGER  |      68319 | 1991-06-09 | 2550.00 |            |   1001
  65646 | JONAS    | MANAGER  |      68319 | 1991-04-02 | 2957.00 |            |   2001
(2 rows)

Explanation:

The provided query in SQL that selects all the columns and rows from the 'employees' table where the job_name is 'MANAGER' and the dep_id is either 1001 or 2001.

In the WHERE clause, records are filtered according to whether the job_name column is equal to 'MANAGER' and the dep_id column is either 1001 or 2001.

The AND operators must satisfy both conditions, while OR operators can satisfy either condition.

Relational Algebra Expression:

Relational Algebra Tree:

Practice Online

Sample Database: employee

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