By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.
select CONCAT(char(1000 / 1000 % 26 + 65 using utf16) ,
char(1000 / 100 % 10 + 48 using utf16) ,
char(1000 / 10 % 10 + 48 using utf16) ,
char(1000 % 10 + 48 using utf16),
char(9999 using utf16 )) ;
| CONCAT(char(1000 / 1000 % 26 + 65 using utf16) , char(1000 / 100 % 10 + 48 using utf16) , char(1000 / 10 % 10 + 48 using utf16) , char(1000 % 10 + 48 using utf16), char(9999 using utf16 )) |
|---|
| B000✏ |