Say I have a customer table with 1:0..1 relationship with another table, I would normally have a Nullable FK in the customer table pointing to the other table.
Consider this table: +-------+-------+-------+-------+ name|hobby1 |hobby2 |hobby3 | +-------+-------+-------+-------+
I recently increased the level of normalisation in my database, going from something like this: +--------------------------------------+
I am having an interesting discussion with another database designer about normalization. In this example, we have a GameTitles table and each record mu开发者_如何学Gost contain the year in which the
I have tons of instances where I need to implement some sort of Polymorphic Associa开发者_JAVA百科tion in my database. I always waste tons of time thinking through all the options all over again. Here
The system rules: Departments can have 0 to many divisions. A division must belong to only one department.
My question is pre开发者_JS百科tty simple. From what I\'ve seen, it seems normalization from 1NF, 2NF, 3NF up to Boyce-Codd form seem to deal mostly the matter of non-prime attributes. If I am not mis
My questions are: 1) If I have the relation R(A,B,C), being AB the primary key, and F = {}, may I assume C depends on AB? I\'d say no, but I\'m asking just to make sure.
I want to create an expense tracking application, where each user can enter expenses and classify them into his own categories. Here is the model definition that I use:
I\'m a jr. developer (5 months on the job), and I have a question about data normalization. Now, as I understand it, the general principle behind data normalization is to create a RDBMS where data red
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