Final answer:
In a database, primary keys are used to link tables.
Step-by-step explanation:
In a database, primary keys are used to link tables. This statement is true.
A primary key is a field or combination of fields in a table that uniquely identifies each record. It is used to establish relationships between tables in a database. For example, if we have a database for a school, the student ID could be the primary key in the student table, and it can be used to link the student table with other tables like courses or grades.