Difference between Primary key and Unique key

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  • Guest

    Difference between Primary key and Unique key

    Primary key does not allow null values at all because it is the key for uniqueness in the table. A table has only one primary key. No replications are allowed in primary key.
    Unique key allow null values but only for single time. A table has one or more more unique keys. it also removes replicated values.
  • Guest

    #2
    Yess.... Right answer.

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