IsEmpty
Returns true (1) if the given value is null or an empty string.
Boolean IsEmpty(String value = null)
Boolean results
Boolean functions return 1 for true and 0 for false. In a WHERE clause compare the result to 1 (or true), for example: WHERE IsLike(Text, 'Cat%') = 1SELECT IsEmpty('') as EmptyString, IsEmpty(null) as NullValue, IsEmpty('x') as Text FROM Single