feature of primary key
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primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records. A primary key's main features are: It must contain a unique value for each row of data. It cannot contain null valies
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A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records. ... A primary key's main features are: It must contain a unique value for each row of data. It cannot contain null values.
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