IS NOT NULL operator
MySQL IS NOT NULL operator will check whether a value is not NULL.
Syntax:
IS NOT NULL
MySQL Version: 5.6
Example: MySQL IS NOT NULL operator
The following MySQL statement it is checked whether 5, 0 and NULL is not NULL.
Code:
SELECT 5 IS NOT NULL,0 IS NOT NULL, NULL IS NOT NULL;
Sample Output:
mysql> SELECT 5 IS NOT NULL,0 IS NOT NULL, NULL IS NOT NULL; +---------------+---------------+------------------+ | 5 IS NOT NULL | 0 IS NOT NULL | NULL IS NOT NULL | +---------------+---------------+------------------+ | 1 | 1 | 0 | +---------------+---------------+------------------+ 1 row 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-is-not-null- php mysql examples | w3resource</title>
<meta name="description" content="example-is-not-null- 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>Checking whether a value IS NOT NULL using MySQL:</h2>
<table class='table table-bordered'>
<tr>
<th>5 IS NOT NULL</th><th>0 IS NOT NULL</th><th>NULL IS NOT NULL</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 5 IS NOT NULL,0 IS NOT NULL, NULL IS NOT NULL') as $row) {
echo "<tr>";
echo "<td>" . $row['5 IS NOT NULL'] . "</td>";
echo "<td>" . $row['0 IS NOT NULL'] . "</td>";
echo "<td>" . $row['NULL IS NOT NULL'] . "</td>";
echo "</tr>";
}
?>
</tbody></table>
</div>
</div>
</div>
</body>
</html>
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