SQL Exercise: Employees whose first or last name begins with D
SQL SORTING and FILTERING on HR Database: Exercise-36 with Solution
36. From the following table, write a SQL query to find the employees whose first or last name begins with 'D'. Return first name, last name.
Sample table : employees
Sample Solution:
SELECT first_name, last_name
FROM employees
WHERE first_name LIKE 'D%'
OR last_name LIKE 'D%';
Sample Output:
first_name | last_name ------------+----------- Lex | De Haan David | Austin Diana | Lorentz Daniel | Faviet Den | Raphaely Curtis | Davies David | Bernstein Louise | Doran Danielle | Greene David | Lee Julia | Dellinger Jennifer | Dilly Donald | OConnell Douglas | Grant (14 rows)
Code Explanation:
The said query in SQL which selects the "first_name" and "last_name" columns from the 'employees' table where the "first_name" column starts with the letter 'D' (specified using the "LIKE" operator with the pattern 'D%') or the "last_name" column starts with the letter 'D' (specified using the "LIKE" operator with the pattern 'D%').
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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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