DECIMAL data type
Go Up to Fixed-decimal Data Types
DECIMAL(x,y)
In the syntax above, InterBase stores at least <x> digits. Of that number, exactly <y> digits are to the right of the decimal point. For example,
DECIMAL(5,2)
declares that a column of this type must be capable of holding at least five but possibly more digits and exactly two digits to the right of the decimal point: ppp.ss.