$sql1 = "DELETE FROM table1 WHERE GUID='123'";
$sql2 = "DELETE FROM table2 WHERE MASTER_GUID='123'";
$sql3 = "DELETE FROM table3 WHERE MASTER_GUID='123'";
$sql4 = "DELETE FROM table4 WHERE MASTER_GUID='123'";
$sql5 = "DELETE FROM table5 WHERE MASTER_GUID='123'";