How to empty Table in MySQL database Daily with cronjobs

you can create a php script.

truncatetable.php
Example:
<?
$db_host = "localhost";
$db_user = "username";
$db_pass = "password";
$db_name = "databasename";
$connect = @mysql_connect($db_host,$db_user,$db_pass);
@mysql_select_db($db_name);

// Empty table
$query = "TRUNCATE TABLE TableName01";
mysql_query($query);
?>

Then setup the cronjob