Define primary key and foreign key .
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A primary key is used to ensure data in the specific column is unique. A foreign key is a column or group of columns in a relational database table that provides a link between data in two tables. ... It refers to the field in a table which is the primary key of another table. 3. Only one primary key is allowed in a table
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A primary key is used to ensure data in the specific column is unique. A foreign key is a column or group of columns in a relational database table that provides a link between data in two tables. It uniquely identifies a record in the relational database table. ... Only one primary key is allowed in a table
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