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HI! im having a little understanding problem about keys. i have 2 tables. one with ID (primary key) and all kind of other stuff. now i have another table, e.g. adress, where i want to make a uniqe coloum connecting 1 to 1 with the ID of the main table. so what i did is connected the ID (primary key) of the first table to the ID (secondary key) of the second table. so how does that work now? because i cant insert anything to the second table since it gives me an error: #1452 - Cannot add or update a child row: a foreign key constraint fails (`logitech`.`cust_time`, CONSTRAINT `cust_time_ibfk_1` FOREIGN KEY (`order_num`) REFERENCES `customer` (`order_num`)). how can i use the second table exactly? in this situation, the data to the second table should be inserted only a few days after the data to the first table. thank you !