1：两个字段类型不一致，导致创建外键引用错误：
ERROR 1215 (HY000): Cannot add foreign key constraint
[2020-05-25 15:51:11] [HY000][1215] Cannot add foreign key constraint [2020-05-25 15:51:11] [HY000][150] Create table ‘xxxx/#sql-60_16‘ with foreign key constraint failed. There is no index in the referenced table where the referenced columns appear as the first columns. [2020-05-25 15:51:11] [HY000][1215] Cannot add foreign key constraint