[英]Inner join and left join not working as expected in mysql
我有3张桌子
table_supplier_bills - bill_id, supplier_id, date
table_supplier_bill_details - bill_id, product_id, quantity, rate
table_supplier_bill_payment_details - id, bill_id, payment_date, amount
我想获取所有带有bill_amount和paid_amount的账单。
这是我的查询。
select
SB.bill_id,
SB.date, SB.supplier_id,
SUM(SBD.quantity * SBD.rate) as bill_amount,
COALESCE(SUM(SBPD.payment_amount), 0.00) as paid_amount
from table_supplier_bills SB
INNER JOIN
table_supplier_bill_details SBD
ON SB.bill_id = SBD.bill_id
LEFT JOIN table_supplier_bill_payment_details SBPD
ON SBD.bill_id = SBPD.bill_id
group by SBD.bill_id;
但是,如果table_supplier_bill_details中有多个行用于帐单,则此查询不会给出正确的pay_amount。 如果存在多行查询,则查询的结果是将pay_amount乘以该表的table_supplier_bill_details中的行数。
谁能帮我这里有什么问题吗?
请使用相关查询:
SELECT SB.bill_id,
SB.date,
SB.supplier_id,
SUM(SBD.quantity * SBD.rate) as bill_amount,
COALESCE((SELECT SUM(SBPD.payment_amount)
FROM table_supplier_bill_payment_details SBPD
WHERE SBD.bill_id = SBPD.bill_id ),0.00) as paid_amount
FROM table_supplier_bills SB
INNER JOIN table_supplier_bill_details SBD
ON SB.bill_id = SBD.bill_id
GROUP BY SBD.bill_id;
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.