What is an attribute of the data that is entered into a primary key column?
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sorry i don't know computer science
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If you have a one-to-one relation between two tables, then the primary key of the details table is a foreign key as well. If you have a m-to-n relation, the junction table has columns relating to the two primary keys of the m and the n-tables. These columns are primary keys and foreign keys at the same time.
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