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!'
