ADD CONSTRAINT `ufd_users_fk` FOREIGN KEY (`userId`)
REFERENCES `users` (`userId`)
ON DELETE CASCADE ON UPDATE CASCADE,
ADD CONSTRAINT `ufd_users_fk` FOREIGN KEY (`friendId`)
REFERENCES `users` (`userId`)
ON DELETE CASCADE ON UPDATE CASCADE;
mysql表中的多个外键指向相同的主键
mysql表中的多个外键指向相同的主键
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