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

SQL employee Database: Exercise-32 with Solution

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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:

Sample Solution:

SELECT *
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

Explanation:

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

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