SQL Exercise: Employees who are CLERK, ANALYST in descending order

Last update on December 20 2024 11:40:36 (UTC/GMT +8 hours)

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70. From the following table, write a SQL query to find those employees who are either 'CLERK' or 'ANALYST’. Sort the result set in descending order on job_name. Return complete information about the employees.

Pictorial Presentation:

Sample table: employees

Sample Solution:

SELECT *
FROM employees
WHERE job_name='CLERK'
  OR job_name='ANALYST'
ORDER BY job_name DESC;

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
  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
  67858 | SCARLET  | ANALYST  |      65646 | 1997-04-19 | 3100.00 |            |   2001
  69062 | FRANK    | ANALYST  |      65646 | 1991-12-03 | 3100.00 |            |   2001
(6 rows)

Explanation:

The said query in SQL that retrieves all the columns and rows from the 'employees' table where the job name is either 'CLERK' or 'ANALYST'. The result set is then arranged in descending order on the job name, that means the the job name beginning with letter 'Z' will come before the letter 'A'.

Relational Algebra Expression:

Relational Algebra Tree:

Practice Online

Sample Database: employee

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