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Select the correct answerWhat SQL statement is used to add a unique constraint to a column?OptionsPRIMARY KEYUNIQUECHECKCONSTRAINT

Question

Select the correct answer

What SQL statement is used to add a unique constraint to a column?

Options:

  • PRIMARY KEY
  • UNIQUE
  • CHECK
  • CONSTRAINT
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Solution

To add a unique constraint to a column in SQL, the correct answer is UNIQUE.

Explanation:

  1. PRIMARY KEY: This enforces uniqueness and identifies each row in a table but is not exclusively used just to add a unique constraint.
  2. CHECK: This is used to limit the values that can be placed in a column but does not specifically enforce uniqueness.
  3. CONSTRAINT: This is a general term for any rule set on a column or table. While you could use this term in conjunction with UNIQUE, it does not by itself denote that a unique constraint is being added.

Therefore, the statement that specifically adds a unique constraint is the UNIQUE statement.

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