savepoint asd;drop table student;select * from student;然后我执行回滚，就报错了，这是什么原因呢rollback to asd;
1305 - SAVEPOINT asd does not exist时间: 0s
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drop 之后再select表不就已经不存在了么，查询语句就报错了，那你savepoint这个点又有什么用呢