Question

select sum(price) 
from product 
where id in (select productid 
             from orders where status!=0 
             and userid=1)

如果我的返回productid =（1,2,2）

总和只是1和2之和，而不是1,2和2的总和

我试过

select sum(price) from product where id in (1,2,2)

同样的结果，我怎么得到模糊的总和？

Answer 1

SELECT SUM(p.price)
FROM product AS p
    LEFT JOIN orders AS o
        ON p.id = o.productid
WHERE o.productid IS NOT NULL
    AND o.status <> 0
    AND o.userid = 1

mysql中只返回不同？

1 个答案: