SQL Exercise: List those employees whose salary contain only 3 digits

SQL employee Database: Exercise-32 with Solution

[An editor is available at the bottom of the page to write and execute the scripts.]

32. From the following table, write a SQL query to identify employees whose salaries contain only three digits. Return complete information about the employees.

Sample table: employees

Pictorial Presentation:

SQL exercises on employee Database: List those employees whose salary contain only 3 digits

Sample Solution:

FROM employees
WHERE length(TRIM(TO_CHAR(salary,'9999'))) = 3;

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


The said query in SQL that selects all columns from the table 'employees' where the length of the salary value, after converting it to a 4-character string with leading zeros, is equal to 3.

The TO_CHAR converts the "salary" column to a character string using the format mask "9999", which means that the salary value will be displayed with leading zeros if necessary to make it 4 digits long. The TRIM function removes any leading or trailing spaces from the resulting string.

The WHERE clause checks if the length of the resulting string after trimming any spaces is exactly 3 characters long.

Practice Online

Sample Database: employee

employee database structure

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous SQL Exercise: List those employees whose salary is an odd value.
Next SQL Exercise: List the employees who joined in the month of APRIL.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

Follow us on Facebook and Twitter for latest update.