Let's say someone is coding a multilingual dictionary in PHP, and he wants to let people submit both words and definitions in English and Spanish, but wants to track it so they can be filtered. ...
The title doesn't make to much sense but i couldn't think a better title for this problem. I have the following tabels Projects id name Customers id id_project name Payments id id_customer ...
For example, a database that is 3NF is always 1NF and 2NF; does this hold for 4, 5, and 6?