Как удалить записи в таблице?

<?php
$user = "root";
$pass = "mysql108";
$db = "station";
 
mysql_connect("localhost",$user,$pass) or die("Could not connect: ".mysql_error());
 
@mysql_query("CREATE DATABASE $db");
 
mysql_select_db($db) or die("Could not select database: ".mysql_error());
 
mysql_query('CREATE TABLE station(id_station INT AUTO_INCREMENT NOT NULL,name VARCHAR(20) NOT NULL,PRIMARY KEY(id_station))') or die ("MySQL error: ".mysql_error());
 
mysql_query('CREATE TABLE train(id_train INT AUTO_INCREMENT NOT NULL,model VARCHAR(20) NOT NULL,PRIMARY KEY(id_train))') or die("MySQL error: ".mysql_error());
 
mysql_query('CREATE TABLE route(id_route INT AUTO_INCREMENT NOT NULL,departure VARCHAR(20) NOT NULL,destination VARCHAR(20) NOT NULL,PRIMARY KEY(id_route))') or die("MySQL error: ".mysql_error());
 
mysql_query('CREATE TABLE ticket(id_ticket INT AUTO_INCREMENT NOT NULL,fio VARCHAR(50) NOT NULL,passport INT NOT NULL,id_route INT NOT NULL,id_train INT NOT NULL,PRIMARY KEY(id_ticket),FOREIGN KEY(id_route) REFERENCES route(id_route) ON UPDATE CASCADE ON DELETE RESTRICT,FOREIGN KEY(id_train) REFERENCES train(id_train) ON UPDATE CASCADE ON DELETE RESTRICT)') or die("MySQL error: ".mysql_error());
 
mysql_query('CREATE TABLE routestation(id_route INT NOT NULL,id_station INT NOT NULL,position VARCHAR(20) NOT NULL,cost INT NOT NULL,FOREIGN KEY(id_route) REFERENCES route(id_route) ON UPDATE CASCADE ON DELETE RESTRICT,FOREIGN KEY(id_station) REFERENCES station(id_station) ON UPDATE CASCADE ON DELETE RESTRICT)') or die("MySQL error: ".mysql_error());
 
?>

<?php
$user = "root";
$pass = "";
$db = "station";
mysql_connect("localhost",$user,$pass) or die("Could not connect: ".mysql_error());
mysql_select_db($db) or die("Could not select database: ".mysql_error());
$urlArray = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH); 
$segments = explode('/', $urlArray); 
$numSegments = count($segments); 
$currentSegment = $segments[$numSegments - 1];
 
mysql_query("DELETE station,train,route,routestation,ticket FROM station,train,route,routestation,ticket WHERE station.id_station=routestation.id_station AND route.id_route=routestation.id_route AND route.id_route=ticket.id_route AND train.id_train=ticket.id_train AND station.id_station='".$currentSegment."'") or die ("MySQL error: ".mysql_error());
 
?>

station.id_station='".$currentSegment."'"