Which of the following statements are true regarding the PRIMARY KEY when creating a table?

All Questions › Category: Database › Which of the following statements are true regarding the PRIMARY KEY when creating a table?
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Anonymous asked 3 years ago

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  1. Each table can have more than one PRIMARY KEY
  2. The PRIMARY KEY ensures that there are no duplicate records
  3. A PRIMARY KEY column can contain NULL values
  4. The PRIMARY KEY uniquely identifies each column in a database table

  5. The PRIMARY KEY must contain UNIQUE values

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Anonymous answered 3 years ago
  1. The PRIMARY KEY ensures that there are no duplicate records
  2. The PRIMARY KEY must contain UNIQUE values