SQL Exercise: List the employees not in department 2001

Last update on December 20 2024 11:40:03 (UTC/GMT +8 hours)

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11. From the following table, write a SQL query to find those employees who do not belong to the department 2001. Return complete information about the employees.

Sample table: employees

Pictorial Presentation:

SQL exercises on employee Database: List the employees who does not belong to department 2001

Sample Solution:

SELECT *
FROM employees
WHERE dep_id NOT IN (2001);

Sample Output:

 emp_id | emp_name | job_name  | manager_id | hire_date  | salary  | commission | dep_id
--------+----------+-----------+------------+------------+---------+------------+--------
  68319 | KAYLING  | PRESIDENT |            | 1991-11-18 | 6000.00 |            |   1001
  66928 | BLAZE    | MANAGER   |      68319 | 1991-05-01 | 2750.00 |            |   3001
  67832 | CLARE    | MANAGER   |      68319 | 1991-06-09 | 2550.00 |            |   1001
  64989 | ADELYN   | SALESMAN  |      66928 | 1991-02-20 | 1700.00 |     400.00 |   3001
  65271 | WADE     | SALESMAN  |      66928 | 1991-02-22 | 1350.00 |     600.00 |   3001
  66564 | MADDEN   | SALESMAN  |      66928 | 1991-09-28 | 1350.00 |    1500.00 |   3001
  68454 | TUCKER   | SALESMAN  |      66928 | 1991-09-08 | 1600.00 |       0.00 |   3001
  69000 | JULIUS   | CLERK     |      66928 | 1991-12-03 | 1050.00 |            |   3001
  69324 | MARKER   | CLERK     |      67832 | 1992-01-23 | 1400.00 |            |   1001
(9 rows)

Explanation:

The said query in SQL that selects all columns from the 'employees' table where the dep_id is not equal to 2001.

The "WHERE" clause filters the results for all employees whose department ID does not match the value 2001

The "NOT IN" operator excludes those department that matched with the values of dep_id 2001.

Relational Algebra Expression:

Relational Algebra Tree:

Practice Online

Sample Database: employee

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