将两个不同表的两个列值相乘

Question

我有一张桌子

ID     DID        DValue
1      100        120
1      200        100
2      100        800
2      200        200

另一张表是

ID    AValue
1     100
2     200

我希望将Dvalue和Avalue相乘，然后除以1000.同一个ID应该有2个值，因为一个DID有id个{ {1}}。

O / P表

id   value
1    value of did 100 * avalue of id 1/1000
1    value of did 200 * avalue of id 1 /1000
2    value of did 100 * avalue of id 2/1000
2    value of did 200 * avalue of id 2 /1000 

Answer 1

只有INNER JOIN两个表格。

SELECT t1.ID, ((t1.Dvalue * t2.Avalue) / 1000) AS Value
FROM yourtable1 t1
INNER JOIN yourtable2 t2 ON t1.Id = t2.Id

表脚本

CREATE TABLE yourtable1
    (`ID` int, `DID` int, `DValue` int)
;

INSERT INTO yourtable1
    (`ID`, `DID`, `DValue`)
VALUES
    (1, 100, 120),
    (1, 200, 100),
    (2, 100, 800),
    (2, 200, 200)
;


CREATE TABLE yourtable2
    (`ID` int, `AValue` int)
;

INSERT INTO yourtable2
    (`ID`, `AValue`)
VALUES
    (1, 100),
    (2, 200)
;

输出

ID  Value
1   12
1   10
2   160
2   40

SQL小提琴：http://sqlfiddle.com/#!9/907b50/1/0

Answer 2

试试这个

SELECT t1.ID, t1.Dvalue*t2.Avalue/1000 from table1 t1 inner join
table2 t2 on t1.Id=t2.Id