场景:
一家每天生产各种尺寸和规格(swg)的钢管的工厂被记录并存储在pipe_production表中(pipe_id是管道表的外键)。工厂还具有定期向其销售管道的客户,根据要求创建发票并将其记录在发票表中。随后,与每个发票相关的管道将存储在pipe_invoices表中。当销售团队的成员对发票进行授权时,发票表中的“授权”列将从“ false”切换为true(0 => 1 in),并表示将出售这些管道并将其从库存中删除。
我正在寻找一个查询,以产生一个库存表来准确地评估管道。但是,我只想查找生产的管道和授权的发票管道之间的区别。
该应用程序是基于Laravel框架构建的。
表:管道
id | description | swg | min_weight | max_weight
1 | 2" X 2" | 16 | 10 | 11
2 | 2" X 2" | 18 | 8 | 19
3 | 1" X 2" | 18 | 4 | 6
表:pipe_productions
id | pipe_id | quantity | production_date
1 | 1 | 1000 | 2020-10-1
2 | 2 | 2000 | 2020-10-1
3 | 3 | 5500 | 2020-10-1
表:发票
id | client_id | authorised | loaded | invoice_date
1 | 1 | 0 | 0 | 2020-10-09
2 | 2 | 1 | 0 | 2020-10-09
3 | 2 | 1 | 1 | 2020-10-09
表格:pipe_invoices
id | invoice_id | pipe_id | quantity
1 | 1 | 3 | 2000
2 | 1 | 1 | 1000
3 | 2 | 2 | 1000
编辑: 我的当前查询仅获得pipe_production和pipe_invoices之间的区别。它不考虑发票未经授权且不应删除的情况。
SELECT *, coalesce(a.quantity, 0)-coalesce(b.quantity, 0) as diff
FROM
(SELECT pipe_id, sum(quantity) as quantity
FROM pipe_productions
GROUP BY pipe_id) a
LEFT JOIN
(SELECT pipe_id, sum(quantity) as quantity
FROM pipe_invoices
GROUP BY pipe_id) b
on a.pipe_id = b.pipe_id
LEFT JOIN pipes
on a.pipe_id = pipes.id
WHERE coalesce(a.quantity, 0)-coalesce(b.quantity, 0) != 0
ORDER BY swg asc, pipe_description desc
答案 0 :(得分:0)
我假设您只需要对查询进行少量修改,并在您的invoices
语句中加入b
:
SELECT *, coalesce(a.quantity, 0)-coalesce(b.quantity, 0) as diff
FROM
(
SELECT pipe_id, sum(quantity) as quantity
FROM pipe_productions
GROUP BY pipe_id
) a
LEFT JOIN
(
SELECT pipe_id, sum(quantity) as quantity
FROM pipe_invoices pi
JOIN invoices i ON pi.invoice_id = i.id
WHERE i.authorised = 1
GROUP BY pipe_id
) b
on a.pipe_id = b.pipe_id
LEFT JOIN pipes
on a.pipe_id = pipes.id
WHERE coalesce(a.quantity, 0)-coalesce(b.quantity, 0) != 0
ORDER BY swg asc, pipe_description desc