SQL Exercise: Information about the department Marketing
SQL SORTING and FILTERING on HR Database: Exercise-5 with Solution
5. From the following table, write a SQL query to find the details of 'Marketing' department. Return all fields.
Sample table: departments
Sample Solution:
SELECT *
FROM departments
WHERE department_name = 'Marketing';
Sample Output:
department_id | department_name | manager_id | location_id ---------------+-----------------+------------+------------- 20 | Marketing | 201 | 1800 (1 row)
Code Explanation:
The said query in SQL that retrieves all columns from the 'departments' table where the department name is 'Marketing'. As a result of the query, a list of all rows in the 'departments' table that match the conditions specified in the "WHERE" clause is returned. The "SELECT *" clause retrieves all columns from the table.
Relational Algebra Expression:
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Previous SQL Exercise: Details of employees without any department number.
Next SQL Exercise: Employees first name does not contain the letter M .
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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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