SQL Exercise: Departments more than 10 employees who get commissions
SQL SORTING and FILTERING on HR Database: Exercise-31 with Solution
31. From the following table, write a SQL query to find the departments where more than ten employees receive commissions. Return department id.
Sample table : employees
Sample Solution:
SELECT department_id
FROM employees
WHERE commission_pct IS NOT NULL
GROUP BY department_id
HAVING COUNT(commission_pct)>10;
Sample Output:
department_id --------------- 80 50 (2 rows)
N.B.: For necessary region structure of the table have changed. Result may vary.
Code Explanation:
The said query in SQL that selects the department_id of employees who have a commission and groups them by department_id. It then only returns departments where the count of employees with a commission_pct is greater than 10.
Relational Algebra Expression:
Relational Algebra Tree:
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Previous SQL Exercise: Departments with managers manage more than 4 employees.
Next SQL Exercise: The date when he left his last job and his employee ID.
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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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