what do you mean by the term primary key
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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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A term primary a special relation data base table column disgneted to uniquealy all table books
Explanation:
A term primary keys main features are-:it must contain unique value for each row of data. it canoot contain null value
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