delete 误删了全表数据

delete from loantradehist where ptrshistid in (select ptrshistid from pvtrshist where pvtrsid = ?);

pvtrshist　表中没有ptrshistid字段，索引它认为这个ptrshistid是从loantradehist中选出来的。

这样in条件就会一直满足，导致悲剧发生了