How is NULL value handled in MySQL give example
You can use the if...else condition to prepare a query based on the NULL value.
The following example takes the tutorial_count from outside and then compares it with the value available in the table.
Example
Copy and paste the following example as mysql_example.php −
Handling NULL
connect_errno ) { printf("Connect failed: %s
", $mysqli->connect_error); exit(); } printf('Connected successfully.
'); if( isset($tutorial_count )) { $sql = 'SELECT tutorial_author, tutorial_count FROM tcount_tbl WHERE tutorial_count = ' + $tutorial_count; } else { $sql = 'SELECT tutorial_author, tutorial_count FROM tcount_tbl WHERE tutorial_count IS NULL'; } $result = $mysqli->query($sql); if ($result->num_rows > 0) { while($row = $result->fetch_assoc()) { printf("Author: %s, Count: %d
", $row["tutorial_author"], $row["tutorial_count"]); } } else { printf('No record found.
'); } $mysqli->close(); ?>
Output
Access the mysql_example.php deployed on apache web server and verify the output.
Connected successfully. No record found.
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