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MySql添加外键报错：Cannot add foreign key constraint
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MySQL添加外键报错 - referencing column 'xx' and referenced column 'xx' in foreign key constraint 'xx' are incompatible
MySQL外键约束冲突异常：com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (...)
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