Tonkz,
Oh boy, you're going to have fun. You're about to learn all about SQL joins. Look them up in the MS SQL manual (w3schools provides a reasonable primer).
In short, there's no unique answer to your question. It depends on which type of join is appropriate to your tables and the particular query you are trying to compose, which itself depends on the way in which your data is normaisled into tables and how the tables are keyed.
Have fun
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