Question

When I try to get the difference between two apparently equal numbers, I get a number different than zero.

product_price       min_product_price   price_dif
40,609756097561     40,609756097561         -2,1316282072803E-14

I understand this can be a difficult question to answer without all the queries that lead to this, but I’ll try to explain,

product_price comes straight from the ERP database.

min_product_price is obtained with a

MIN(ItemSellingPrices.UnitPrice) as min_product_price

together with a group by clause. Shouldn’t this mean the numbers are the same?

I have no experience with this kind of issues, so I apologize if this is too basic.

Answer 1

Looks like a floating point issue.

If you’re storing money values in float or real columns, try using a decimal/numeric data type instead.

For storing 12 decimal values, you could use decimal(18, 12), for example.