将一个表中的值与第二个表中字段的所有行相乘

Question

I have two tables. I want to multiply a single factor value from the currency table with all the rows of the Price field from the Product table.

Select Product.ID, (Product.Price* (select factor from Currency)) as NewPrice,
       Product.weight, Product.description
from Product,
     Currency

It does not seem to work. Please suggest the correct statement.

Answer 1

It should be something like this (except the currency id on which you join the tables):

Select P.ID
      ,P.Price*C.factor as NewPrice
      ,P.weight
      ,P.description
from Product P
INNER JOIN Currency C
    ON P.[currencyID] = C.[currencyID]