A packed exact fixed-point number.
M is the total number of digits.
D is the number of digits after the decimal point.
The decimal point and (for negative numbers) the '-' sign are not counted in M.
The maximum number of digits (M) is 65.
The maximum number of decimals (D) is 30.
If D is omitted, the default is 0.
If M is omitted, the default is 10.
DEC[(M[,D])] [UNSIGNED] [ZEROFILL], NUMERIC[(M[,D])] [UNSIGNED] [ZEROFILL], FIXED[(M[,D])] [UNSIGNED] [ZEROFILL] are synonyms for DECIMAL.