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16 July, 23:58

Define the term unique key and give an example.

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  1. 17 July, 03:36
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    Answer: Unique is used for the prevention of any field or column to have same or identical values in a particular table. It however, does let the null value top enter the table even though stops entry of duplicate values.

    Example - In any particular record of shop, the shopkeeper avoids to have a product that is of the same price as to maintain the clarity of the table.
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