小编Ste*_*veo的帖子

我正在尝试进行乘法求和但似乎无法找出为什么它不起作用.我已经找到了天数,但现在需要将其乘以每日费用.

有人可以帮忙吗？

SELECT `Daily_Charge`, DATEDIFF(End_Date,Start_Date) AS `Total`, 
`Total`*Daily_Charge AS `Done` FROM `Car`,`Contract` WHERE `Contract_Id`="1";

有人可以解释我是如何得到这个答案的:

三次两次= 6次

码:

public class Params1 {
    public static void main(String[] args) {
        String one = "two";
        String two = "three";
        String three = "1";
        int number = 20;
        sentence(one, two, 3);
    }

    public static void sentence(String three, String one, int number) {
        String str1 = one + " times " + three + " = " + (number * 2);
    }

}