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Mentions the difference between unique key and primary key?

All Questions › Category: Database › Mentions the difference between unique key and primary key?
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chetan shidling asked 3 years ago

I need short information.

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chetan shidling answered 3 years ago

Unique Key

  1. The unique key can have a NULL value.
  2. Each table can have more than one unique key.

 
Primary Key

  1. The primary key cannot have a NULL value.
  2. Each table can have only one primary key.