SQL Exercise: Find those employees who earn below 6000
SQL SORTING and FILTERING on HR Database: Exercise-1 with Solution
1. From the following table, write a SQL query to find those employees whose salaries are less than 6000. 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 salary < 6000;
Sample Output:
full_name | salary
-------------------+---------
David Austin | 4800.00
Valli Pataballa | 4800.00
Diana Lorentz | 4200.00
Alexander Khoo | 3100.00
Shelli Baida | 2900.00
Sigal Tobias | 2800.00
Guy Himuro | 2600.00
Karen Colmenares | 2500.00
Kevin Mourgos | 5800.00
Julia Nayer | 3200.00
Irene Mikkilineni | 2700.00
James Landry | 2400.00
Steven Markle | 2200.00
Laura Bissot | 3300.00
Mozhe Atkinson | 2800.00
James Marlow | 2500.00
TJ Olson | 2100.00
Jason Mallin | 3300.00
Michael Rogers | 2900.00
Ki Gee | 2400.00
Hazel Philtanker | 2200.00
Renske Ladwig | 3600.00
Stephen Stiles | 3200.00
John Seo | 2700.00
Joshua Patel | 2500.00
Trenna Rajs | 3500.00
Curtis Davies | 3100.00
Randall Matos | 2600.00
Peter Vargas | 2500.00
Winston Taylor | 3200.00
Jean Fleaur | 3100.00
Martha Sullivan | 2500.00
Girard Geoni | 2800.00
Nandita Sarchand | 4200.00
Alexis Bull | 4100.00
Julia Dellinger | 3400.00
Anthony Cabrio | 3000.00
Kelly Chung | 3800.00
Jennifer Dilly | 3600.00
Timothy Gates | 2900.00
Randall Perkins | 2500.00
Sarah Bell | 4000.00
Britney Everett | 3900.00
Samuel McCain | 3200.00
Vance Jones | 2800.00
Alana Walsh | 3100.00
Kevin Feeney | 3000.00
Donald OConnell | 2600.00
Douglas Grant | 2600.00
Jennifer Whalen | 4400.00
(50 rows)
Code Explanation:
The said query in SQL which retrieves the full name (concatenation of first name and last name with a space in between) and salary columns of employees whose salary is less than 6000.
The result will be a table with two columns: "Full_Name" and "salary", with each row representing an employee that meets the condition.
Practice Online
Query Visualization:
Duration:
Rows:
Cost:
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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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