MySQL DELETE statement

You can use the SQL DELETE FROM command to delete records in a MySQL data table.
The command can be executed from the mysql> command prompt or a PHP script.

The following is the general syntax of the SQL DELETE statement to delete data from a MySQL data table:

DELETE FROM table_name [WHERE Clause]

• If no WHERE clause is specified, all records in the MySQL table will be deleted.
• Any condition can be specified in the WHERE clause.
• Records can be deleted all at once in a single table.
• The WHERE clause is useful when deleting specified records in a data table.

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Delete data from the command line

The following example deletes the record with runoob_id 3 in the runoob_tbl table:

MariaDB [(none)]> use RUNOOB
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
MariaDB [RUNOOB]> delete from runoob_tbl where runoob_id=3;
Query OK, 1 row affected (0.03 sec)

MariaDB [RUNOOB]>

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Delete data using PHP script

PHP uses the mysql_query() function to execute SQL statements. You can use the WHERE clause with or without the SQL DELETE command.

This function has the same effect as the mysql> command to execute SQL commands.

The following PHP example will delete the record with runoob_id 3 in the runoob_tbl table:

1. <?php
2. $dbhost = 'localhost:3036';
3. $dbuser = 'root';
4. $dbpass = 'rootpassword';
5. $conn = mysql_connect($dbhost, $dbuser, $dbpass);
6. if(! $conn )
7. {
8. die('Could not connect: ' . mysql_error());
9. }
10. $sql = 'DELETE FROM runoob_tbl
11. WHERE runoob_id=3';
13. mysql_select_db('RUNOOB');
14. $retval = mysql_query( $sql, $conn );
15. if(! $retval )
16. {
17. die('Could not delete data: ' . mysql_error());
18. }
19. echo "Deleted data successfully\n";
20. mysql_close($conn);
21. ?>

operation result