______ is NOT a type of constraint in SQL language?

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Editor">Editor Staff asked 2 years ago

______ is NOT a type of constraint in SQL language?

  1. FOREIGN KEY
  2. PRIMARY KEY
  3. UNIQUE
  4. ALTERNATE KEY
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1 Answers
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Editor">Editor Staff answered 2 years ago

Answer:
ALTERNATE KEY
Explanation: ALTERNATE KEY is a key associated with one or more columns to identify each row in a table uniquely. If a table with one or more candidate keys, then the keys other than the primary key is an alternate key. Since the alternate key is a part of the candidate key, it is not a constraint in SQL. Hence, option D is the correct choice.