SQL Exercise: Employees who does not earn any commission
SQL SORTING and FILTERING on HR Database: Exercise-8 with Solution
8. From the following table, write a SQL query to find those employees who do not earn any commission. Return full name (first and last name), and salary.
Sample table : employees
Sample Solution:
SELECT first_name ||' '||last_name AS Full_Name, salary
FROM employees
WHERE commission_pct IS NULL;
Sample Output:
full_name | salary -----------+-------- (0 rows)
Code Explanation:
The said query in SQL that retrieves the first name, last name concatenated as "Full_Name" and salary columns from the 'employees' table where the commission_pct is null.
Practice Online
N.B.: In certain instances not null is removed in table structure, so results may vary.

Query Visualization:
Duration:

Rows:

Cost:

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Previous SQL Exercise: Employees with salaries of given range and commission.
Next SQL Exercise: Find employees whose salary is within 9000 to 17000.
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SQL: Tips of the Day
Difference between natural join and inner join
One significant difference between INNER JOIN and NATURAL JOIN is the number of columns returned-
Consider:
TableA TableB +------------+----------+ +--------------------+ |Column1 | Column2 | |Column1 | Column3 | +-----------------------+ +--------------------+ | 1 | 2 | | 1 | 3 | +------------+----------+ +---------+----------+
The INNER JOIN of TableA and TableB on Column1 will return
SELECT * FROM TableA AS a INNER JOIN TableB AS b USING (Column1); SELECT * FROM TableA AS a INNER JOIN TableB AS b ON a.Column1 = b.Column1;
+------------+-----------+---------------------+ | a.Column1 | a.Column2 | b.Column1| b.Column3| +------------------------+---------------------+ | 1 | 2 | 1 | 3 | +------------+-----------+----------+----------+
The NATURAL JOIN of TableA and TableB on Column1 will return:
SELECT * FROM TableA NATURAL JOIN TableB +------------+----------+----------+ |Column1 | Column2 | Column3 | +-----------------------+----------+ | 1 | 2 | 3 | +------------+----------+----------+
Ref: https://bit.ly/3AG5CId
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