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Process of Joining Tables Together with Primary Keys

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In database, please example the process of joining tables together. Why is it important to join tables with their primary keys?

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Why is it important to join tables with their primary keys is determined.

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Join is most import feature of any database.

Having the capability to select data from multiple tables is one of SQL's most powerful features. Without this capability, the entire relational database concept would not be feasible. Single-table queries are sometimes quite informative, but in the real world, the most practical queries are those whose data is acquired from multiple tables within the database.

The reason why you should join tables using primary keys (other keys also) if, in the end, you are only going to rejoin the tables to retrieve the data you want. You rarely select all data ...

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