For now there is no special support for returning values although it may be added at a later version. To return an *int* or *real* result you just use a plain C return statement with the appropriate return value. To return a *%NULL%* value from any function you have to set the variable pointed to by the *%is_null%* function parameter to *1*. For strings up to 255 characters long you have to copy the string to the location pointed to by the *%result%* paramter and store its length in the varibale pointed to by the *%length%* parameter. Returning longer strings requires memory allocation within the UDF and is not yet supported. *%datetime*% values need to be returned as strings for now.