4. Elements of OpenSQL Statements : Operations : Arithmetic Operations : Arithmetic Operations on Decimal Data Types
 
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Arithmetic Operations on Decimal Data Types
In expressions that combine decimal values and return decimal results, the precision (total number of digits) and scale (number of digits to the right of the decimal point) of the result can be determined, as shown in the following table:
Precision
Scale
Addition and subtraction
Larger number of fractional digits plus largest number of non‑fractional digits + 1 (to a maximum of 39)
Scale of operand having the largest scale
Multiplication
Total of precisions to a maximum of 39
Total of scales to a maximum of 39
Division
39
(39 precision of first operand) + (scale of first operand) (scale of second operand)
For example, in the following decimal addition operation:
1.234 + 567.89
the scale and precision of the result is calculated as follows:
Precision = 7
Calculated as 3 (larger number of fractional digits) + 3 (larger number of non‑fractional digits) + 1 = 7
Scale = 3
The first operand has the larger number of digits to the right of the decimal point
Result:
0569.124
Note:  If the result of arithmetic using decimal data exceeds the declared precision or scale of the column to which it is assigned, OpenSQL truncates the result and does not issue an error.