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  • Gnana Divya

    Member
    September 12, 2020 at 3:11 pm

    Primary key must be one or none for a table, because its value is unique for each record

    It is used to connect to different tables because of unique values, name itself says that it is the 1st priority (so one for a table)

    It is like head of family, which is used to identify every tuple uniquely