这是正确的方法吗？
DELETE t1, t2, t3, t4 FROM
table1 as t1
INNER JOIN table2 as t2 on t1.id = t2.id
INNER JOIN table3 as t3 on t1.id=t3.id
INNER JOIN table4 as t4 on t1.id=t4.id
WHERE t1.username='%s' AND t1.id='%s'