CrazyEngineers
CrazyEngineers
Howdy guest!
Dear guest, you must be logged-in to participate on CrazyEngineers. We would love to have you as a member of our community. Consider creating an account or login.
Replies

  • vinci

    Member • Sep 2, 2011

    UNIQUE KEY DEFINES ALL THE ROWS IN TABLE UNIQUELY .AND BASICALLY OCCURS ONLY SINGLE UNIQUE KEY IN ONE TABLE WHILE SUPER KEY UNIQUELY IDENTIFY A TUPLE AND NOT ALL THE ROWS i.e NO TWO TU PLES HAVE SAME ATTRIBUTES IN SUPER KEY
    Are you sure? This action cannot be undone.
    Cancel

  • TheV

    Member • Sep 3, 2011

    I am confused....!!! What is the difference between tuples and rows.
    Are you sure? This action cannot be undone.
    Cancel

  • Manish Goyal

    Member • Sep 3, 2011

    TheV
    I am confused....!!! What is the difference between tuples and rows.
    Tuple is nothing but another name of rows in database


    Unique key is just a single attribute (Column) where as super key is a set of attributes

    However both have same function ie to identify rows of a table uniquely
    Are you sure? This action cannot be undone.
    Cancel

  • TheV

    Member • Sep 4, 2011

    Thankyou Goyal....!

    But In wikipedia the defination of unique is a one column or a set of columns which Identify the tuples or row uniquely.

    First line, second sentence,,..<a href="https://en.wikipedia.org/wiki/Unique_key" target="_blank" rel="nofollow noopener noreferrer">Unique Key</a>
    Are you sure? This action cannot be undone.
    Cancel

  • Manish Goyal

    Member • Sep 4, 2011

    TheV
    Thankyou Goyal....!

    But In wikipedia the defination of unique is a one column or a set of columns which Identify the tuples or row uniquely.

    First line, second sentence,,..<a href="https://en.wikipedia.org/wiki/Unique_key" target="_blank" rel="nofollow noopener noreferrer">Unique Key</a>
    unique key may or may not contain set of column , while super key is basically a set of attributes
    Are you sure? This action cannot be undone.
    Cancel
Home Channels Search Login Register