MySql导入.sql文件时外键报错,a foreign key constraint fails,Cannot add foreign key constraint

                              MySql导入.sql文件时外键报错 通过Navicat for MySQL或者SQLyog等数据库操作工具导出.sql文件时,会发现再次导入的时候会报错: Error Code: 1217 - Cannot delete or update a parent row: a foreign key constraint fails Err
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