Mysql NOT LIKE operator ~ Tech Blog

Tuesday 10 July 2018

Mysql NOT LIKE operator

MySQL NOT LIKE operator along with WILDCARDS checks whether a string of a specified pattern is not present within another string.

Syntax:

NOT LIKE pat

Argument

Name	Description
pat	A pattern not to be matched.

Example of MySQL not like operator with wildcard ( _ ) underscore

Sample table: author

Code:

SELECT * FROM author 
WHERE aut_name NOT LIKE '_______________'; 



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Explanation

The above MySQL statement will return those rows from the table author in which the length of the author’s name is not exactly 15 characters. Fifteen instances of ‘_’ pattern character has been used to indicate 15 characters.

Sample Output:

mysql> SELECT * FROM author 
    -> WHERE aut_name NOT LIKE '_______________';
+--------+----------------------+-----------+----------------+
| aut_id | aut_name             | country   | home_city      |
+--------+----------------------+-----------+----------------+
| AUT001 | William Norton       | UK        | Cambridge      | 
| AUT005 | Thomas Morgan        | Germany   | Arnsberg       | 
| AUT006 | Thomas Merton        | USA       | New York       | 
| AUT007 | Piers Gibson         | UK        | London         | 
| AUT008 | Nikolai Dewey        | USA       | Atlanta        | 
| AUT009 | Marquis de Ellis     | Brazil    | Rio De Janerio | 
| AUT010 | Joseph Milton        | USA       | Houston        | 
| AUT011 | John Betjeman Hunter | Australia | Sydney         | 
| AUT012 | Evan Hayek           | Canada    | Vancouver      | 
| AUT013 | E. Howard            | Australia | Adelaide       | 
| AUT014 | C. J. Wilde          | UK        | London         | 
| AUT015 | Butler Andre         | USA       | Florida        | 
+--------+----------------------+-----------+----------------+
12 rows in set (0.00 sec)

PHP script

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>example-not-like-function  php-mysql examples | w3resource</title>
<meta name="description" content="example-not-like-function  php-mysql examples | w3resource">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-12">
<h2>List of authors with all their detail available, where name of the author does not contain exactly fifteen characters:</h2>
<table class='table table-bordered'>
<tr> 
<th>Author's ID</th><th>Author's name</th><th>Country</th><th>Home City</th>
</tr>
<?php
$hostname="your_hostname";
$username="your_username";
$password="your_password";
$db = "your_dbname";
$dbh = new PDO("mysql:host=$hostname;dbname=$db", $username, $password);
foreach($dbh->query('SELECT * FROM author WHERE aut_name NOT LIKE "_______________"') as $row) {
echo "<tr>";
echo "<td>" . $row['aut_id'] . "</td>";
echo "<td>" . $row['aut_name'] . "</td>";
echo "<td>" . $row['country'] . "</td>";
echo "<td>" . $row['home_city'] . "</td>";
echo "</tr>";
}
?>
</tbody></table>
</div>
</div>
</div>
</body>
</html>



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Example of MySQL not like operator with wildcard (%)