SQL 2 table 列之间的差异

Question

场景：
一家工厂每天生产各种尺寸和规格 (swg) 的钢管，记录并存储在 pipe_production table（pipe_id 管道外键 table).工厂也有定期向其销售管道的客户，根据要求创建发票并记录在发票中 table。随后，与每个发票相关的相关管道存储在pipe_invoices table中。当销售团队的一名成员授权发票时，发票 table 中的授权列从 false 切换为 true（0 => 1 英寸），并表示这些管道将被出售并应从库存中移除.

我正在寻找生成库存的查询 table 以在现场准确评估管道。然而，我只是想找出生产的管道和授权发票管道之间的区别。

应用程序正在 Laravel 框架上构建。

Table: 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

Table: 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

Table：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

Table: pipe_invoices

id | invoice_id | pipe_id | quantity 
1  | 1          | 3       | 2000
2  | 1          | 1       | 1000
3  | 2          | 2       | 1000

编辑：我的当前查询仅获取 pipe_production 和 pipe_invoices 之间的差异。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

Answer 1

我假设您只需要对您的查询进行少量调整，并在您的 b 语句中加入 invoices：

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

SQL 2 table 列之间的差异

SQL difference between 2 table columns

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difference