After all the tables in a database application have been created and their primary keys designated,the tables can be related to one another via their primary key so that a primary key for one table can be used to extract data from other tables as needed.

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This statement is true. Primary keys are used as a means to link tables together in a database application. By designating a primary key in a table, the values in that column can be used to extract data from other tables that have a relationship to it. This is a key feature of relational databases.

After All the Tables in a Database Application Have Been