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Which is not a valid string function -

  1. CONCAT

  2. LENGTH

  3. ASCII

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

CONCAT, LENGTH, and ASCII are all standard SQL string functions available in most database systems. The question asks which is NOT valid, and since all three options (A, B, C) are valid functions, 'None of the above' correctly indicates that all listed functions are valid.

AI explanation

CONCAT, LENGTH, and ASCII are all standard, valid SQL string functions — CONCAT joins strings together, LENGTH returns a string's character count, and ASCII returns the numeric ASCII code of a character. Since every listed option actually is a valid string function, the correct answer to 'which is NOT a valid string function' is 'None of the above' — there's no invalid one among the choices given.

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