Relationship between primary key of one table to primary key of another table is called one to one.
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The primary key of one table may also help to identify records in other tables, and be part of the second table's primary key. The instance of the first table's primary key in the second table is referred to as a foreign key.
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The primary key of one table may also help to identify records in other tables, and be part of the second table's primary key. The instance of the first table's primary key in the second table is referred to as a foreign key.
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