I've been diving into how database modeling and relationships work in real-world applications. I mostly come across *1..N* and *N..N* relationships, but I'm noticing that *1..1* relationships are much less common. Sometimes, it seems like they can even be effectively managed within a single table to boost performance. So, I'm curious—do *1..1* relationships make sense at all, or are there situations where they are genuinely necessary?
1 Answer
Actually, there are definite scenarios for one-to-one relationships! For instance, think about a person and their unique social security number. In cases like that, there might be reasons related to access privileges that necessitate separating the data into different tables instead of sticking it all in one place. This ensures sensitive information is handled appropriately without compromising security.
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