SQL Exercise: Display Employees whose last name is McEwen
SQL SORTING and FILTERING on HR Database: Exercise-3 with Solution
3. From the following table, write a SQL query to find those employees whose last name is "McEwen". Return first name, last name and department ID.
Sample table: employees
Sample Solution:
SELECT first_name, last_name, department_id
FROM employees
WHERE last_name = 'McEwen';
Sample Output:
first_name | last_name | department_id ------------+-----------+--------------- Allan | McEwen | 80 (1 row)
Code Explanation:
The said query in SQL that retrieves first name, last name, and department ID columns from the "employees" table where the last name is 'McEwen'. As a result of the query, all the rows that meet the condition stipulated in the "WHERE" clause will be returned from the 'employees' table.
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Previous SQL Exercise: Find those employees who earn more than 8000.
Next SQL Exercise: Details of employees without any department number.
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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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