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Which of the following SQL constraints ensures that a column has a unique identity and NOT NULL?

All Questions › Category: Database › Which of the following SQL constraints ensures that a column has a unique identity and NOT NULL?
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Anonymous asked 3 years ago

Options:

  1. PRIMARY KEY
  2. DEFAULT
  3. FOREIGN KEY

  4. UNIQUE

1 Answers
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Anonymous answered 3 years ago
  1. PRIMARY KEY