”;
If you want to delete a record from any MySQL table, then you can use the SQL command DELETE FROM. You can use this command at the mysql> prompt as well as in any script like PHP.
Syntax
The following code block has a generic SQL syntax of the DELETE command to delete data from a MySQL table.
DELETE FROM table_name [WHERE Clause]
-
If the WHERE clause is not specified, then all the records will be deleted from the given MySQL table.
-
You can specify any condition using the WHERE clause.
-
You can delete records in a single table at a time.
The WHERE clause is very useful when you want to delete selected rows in a table.
Deleting Data from the Command Prompt
This will use the SQL DELETE command with the WHERE clause to delete selected data into the MySQL table – tutorials_tbl.
Example
The following example will delete a record from the tutorial_tbl whose tutorial_id is 3.
root@host# mysql -u root -p password; Enter password:******* mysql> use TUTORIALS; Database changed mysql> DELETE FROM tutorials_tbl WHERE tutorial_id=3; Query OK, 1 row affected (0.23 sec) mysql>
Deleting Data Using a PHP Script
PHP uses mysqli query() or mysql_query() function to delete records in a MySQL table. This function takes two parameters and returns TRUE on success or FALSE on failure.
Syntax
$mysqli→query($sql,$resultmode)
| Sr.No. | Parameter & Description |
|---|---|
| 1 |
$sql
Required – SQL query to delete records in a MySQL table. |
| 2 |
$resultmode
Optional – Either the constant MYSQLI_USE_RESULT or MYSQLI_STORE_RESULT depending on the desired behavior. By default, MYSQLI_STORE_RESULT is used. |
Example
Try the following example to delete a record in a table −
Copy and paste the following example as mysql_example.php −
<html>
<head>
<title>Deleting MySQL Table record</title>
</head>
<body>
<?php
$dbhost = ''localhost'';
$dbuser = ''root'';
$dbpass = ''root@123'';
$dbname = ''TUTORIALS'';
$mysqli = new mysqli($dbhost, $dbuser, $dbpass, $dbname);
if($mysqli→connect_errno ) {
printf("Connect failed: %s<br />", $mysqli→connect_error);
exit();
}
printf(''Connected successfully.<br />'');
if ($mysqli→query(''DELETE FROM tutorials_tbl where tutorial_id = 4'')) {
printf("Table tutorials_tbl record deleted successfully.<br />");
}
if ($mysqli→errno) {
printf("Could not delete record from table: %s<br />", $mysqli→error);
}
$sql = "SELECT tutorial_id, tutorial_title, tutorial_author, submission_date FROM tutorials_tbl";
$result = $mysqli→query($sql);
if ($result→num_rows > 0) {
while($row = $result→fetch_assoc()) {
printf("Id: %s, Title: %s, Author: %s, Date: %d <br />",
$row["tutorial_id"],
$row["tutorial_title"],
$row["tutorial_author"],
$row["submission_date"]);
}
} else {
printf(''No record found.<br />'');
}
mysqli_free_result($result);
$mysqli→close();
?>
</body>
</html>
Output
Access the mysql_example.php deployed on apache web server and verify the output. Here we”ve entered multiple records in the table before running the select script.
Connected successfully. Table tutorials_tbl record deleted successfully. Id: 1, Title: MySQL Tutorial, Author: Mahesh, Date: 2021 Id: 2, Title: HTML Tutorial, Author: Mahesh, Date: 2021 Id: 3, Title: PHP Tutorial, Author: Mahesh, Date: 2021 Id: 5, Title: Apache Tutorial, Author: Suresh, Date: 2021
”;