SQL Exercise: List the employees who are either CLERK or MANAGER

Last update on December 20 2024 11:40:21 (UTC/GMT +8 hours)

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40. From the following table, write a SQL query to find those employees who are either CLERK or MANAGER. Return complete information about the employees.

Sample table: employees

Pictorial Presentation:

Sample Solution:

SELECT *
FROM employees
WHERE job_name IN ('CLERK','MANAGER');

Sample Output:

 emp_id | emp_name | job_name | manager_id | hire_date  | salary  | commission | dep_id
--------+----------+----------+------------+------------+---------+------------+--------
  66928 | BLAZE    | MANAGER  |      68319 | 1991-05-01 | 2750.00 |            |   3001
  67832 | CLARE    | MANAGER  |      68319 | 1991-06-09 | 2550.00 |            |   1001
  65646 | JONAS    | MANAGER  |      68319 | 1991-04-02 | 2957.00 |            |   2001
  63679 | SANDRINE | CLERK    |      69062 | 1990-12-18 |  900.00 |            |   2001
  68736 | ADNRES   | CLERK    |      67858 | 1997-05-23 | 1200.00 |            |   2001
  69000 | JULIUS   | CLERK    |      66928 | 1991-12-03 | 1050.00 |            |   3001
  69324 | MARKER   | CLERK    |      67832 | 1992-01-23 | 1400.00 |            |   1001
(7 rows)

Explanation:

The said query in SQL that retrieves all columns from the 'employees' table.

The WHERE clause includes rows that the "job_name" column must be equal to either 'CLERK' or 'MANAGER'.

Relational Algebra Expression:

Relational Algebra Tree:

Practice Online

Sample Database: employee

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