> | III.3 Constants Numeric constants consist of a sequence of digits, followed by a radix specifier. The first character must always be a decimal digit. The legal digits and radix specifiers are:
> constant | digits | radix
> --- | --- | ---
> binary | 0 ... 1 | B
> octal | 0 ... 7 | Q or O
> decimal | 0 ... 9 | D or none
> hex | 0 ... F | H
> Thus, for example, the following constants are equivalent:
>     1111111B      binary
>         177Q      octal
>         177o      octal
>          127      decimal
>         127d      decimal
>         07FH      hex
> Character constants may be used wherever a numeric value is allowed. A character constant consists of one or two printing characters enclosed in single or double quotes. The quote character itself can be represented by two subsequent quotes. For example:
>      'X'       8 bit constant:       58H
>     "a@"      16 bit constant:     6140H
>     ''''       8 bit constant:       27H
> In DB statements, character constants may have any length. In this case, we call it a character string. For example:
>     'This is only text!'