## Maya Opperman wrote:

*Is there an way of preventing an overflow error no the following stored procedure calculation*

OExtendedPrice = cast((IPrice * IQty) as decimal(18,2)); IQTY decimal(18,3) = 100.000 IPRICE decimal(18,2) = 4,039,250,052,178.13 OEXTENDEDPRICE decimal(18,2) will be 403,925,005,217,813.00 (still within 18 significant digits, 17 actually)

*I tried*:

OExtendedPrice = cast((IPrice * IQty) as decimal(18,2));

*but it still gives an error.*

*I know it gives an error because the result is 403,925,005,217,813.00000 before being passed
to 403,925,005,217,813.00, but is there any way I can tell it to drop the last 3 decimal
places up front?*

## Ivan Prenosil answers:

I showed the solution on FB Conference 2006, you can obtain correct result by using this "formula":

A × (B+C) = A × B + A × C

i.e. split one of the values into integer and fraction part, and cast intermediate NUMERIC(x,5) to (x,2), e.g.:

IPrice * CAST(IQty AS BIGINT) + CAST(IPrice * (IQty - CAST(IQty AS BIGINT)) AS NUMERIC(18,2))