error1062 ALTER TABLE causes auto_increment resequencing, resulting in duplicate entry ’1′ for
设置主键字段为自动递增时报错ALTERTABLEcausesauto_incrementresequencing,resultinginduplicateentry’1′forkey‘PRIMARY’需要把数据中已存在主键值为0的记录,改成不为0且不重复的任意数字。另外flask-sqlachemy的查询语句eg:exist=User.query.get(user_name)get()里写主键字段