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Meaning of 'n:m' and '1:n' in database design

2022-07-07 04:34:00 【Zafo】

problem ：

In database design what do n:m and 1:n mean? In database design n:m and 1:n What does that mean? ？

Does it have anything to do with keys or relationships? Is it related to the key or relationship ？

Solution ：

Reference resources ： https://stackoom.com/en/question/EFnx
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