我一直在尝试计算每个" BESTELLING_ID"的总价。但我不知道从哪里开始。对bestelling_id进行分组似乎不起作用。在这里,您可以看到查询的结果,我想要计算每个" BESTELLING_ID"的计算值。我一直试图看看其他问题,但我似乎无法将答案与我的问题联系起来。我想用这个图表显示每个订单的个人订单价值。提前谢谢。
BESTELLING_ID NAAM ((P.PRIJS)*(R5.GEWICHT/100))
1 ui .25
1 pindakaas 1.7
22 Broccoli 1
22 Rijst 1
select b.bestelling_id ,p.naam, ((p.prijs)* (r5.gewicht/100))
from relation_6 r6
join bestellingregel br on br.dieet_dieet_id= r6.dieet_id
join bestelling b on br.bestelling_id=b.bestelling_id
join relation_5 r5 on r5.recept_recept_id= r6.recept_id
join product p on p.product_id = r5.product_product_id
where p.winkelbeheer_winkelbeheer_id=2
order by b.datum
;
答案 0 :(得分:1)
使用此:
select
a.col1 as BESTELLING_ID,sum(a.col3) as Total_Price
from (
SELECT b.bestelling_id col1, p.naam col2, ( (p.prijs) * (r5.gewicht / 100)) col3
FROM relation_6 r6
JOIN bestellingregel br ON br.dieet_dieet_id = r6.dieet_id
JOIN bestelling b ON br.bestelling_id = b.bestelling_id
JOIN relation_5 r5 ON r5.recept_recept_id = r6.recept_id
JOIN product p ON p.product_id = r5.product_product_id
WHERE p.winkelbeheer_winkelbeheer_id = 2
ORDER BY b.datum ) a
group by a.col1;
答案 1 :(得分:0)
您不需要子查询,只需group by
:
select b.bestelling_id, sum((p.prijs)* (r5.gewicht/100))
from relation_6 r6 join
bestellingregel br
on br.dieet_dieet_id = r6.dieet_id join
bestelling b
on br.bestelling_id = b.bestelling_id join
relation_5 r5
on r5.recept_recept_id = r6.recept_id join
product p
on p.product_id = r5.product_product_id
where p.winkelbeheer_winkelbeheer_id = 2
group by b.bestelling_id;
您可以在p.naam
和select
中加入group by
,假设每bestselling_id
只有一个名称。