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mysql中 建立一个用户表，一个订单表。将用户表中的uid,uname设为主键，订单表中的uid,uname怎么同时和主表关联

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mysql中 建立一个用户表，一个订单表。将用户表中的uid,uname设为主键，订单表中的uid,uname怎么同时和主表关联

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一般情况下只需要uid作为主标关联的主键,uname不建议使用,也不建议作为联合索引,uid是唯一的,uname就用不到,还会增加插入,更新,删除操作难度!


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