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  • and is any string.


  • The NULLIF function returns a value with the type of the first argument or NULL.
  • This function accepts exactly two arguments.
  • Here two expressions to be compared.
  • If the first argument is not equal to the second one, the NULLIF function returns the first argument.
  • In case both arguments are NULL, the NULLIF function returns a NULL value.


  1. NULLIF(25, 25) = 25
  2. NULLIF('Hello', 'Hello') = Hello
  3. NULLIF('Hello', 'world') = Hello

See Also