如何通过计算IN和OUT之差来计算物理量

Question

我正在开发一个库存控制应用程序，我正在使用 MySQL RDBMS 和 InnoDB 引擎，目前我想生成一个报告，通过计算产品之间的差异来计算产品的物理数量IN_OUT 列的 SUM 使用 MySQL 查询。

我使用 in_out_products 中的值“1”作为 IN，“0”作为 OUT

所以我需要一个在 IN 和 OUT 之间有区别的列
IN - OUT =实物数量 每件商品

以更清楚的方式，我的意思是 SUM(quantity) where in_out=1 和 SUM(quantity) where in_out=0 ,in_out 列在 in_out_products table

第一个table

select * from products;


+------------+--------------+-------------+----------------+-------+------------+
| product_id | product_code | part_number | product_name   | brand | location   |
+------------+--------------+-------------+----------------+-------+------------+
|          1 | 100100       | 100200      | RICHO maginate | RICHO | location 4 |
|          2 | 1112211      | 100300      | RICHO Cyan     | RICHO | location 4 |
|          3 | 111333       | 100400      | RICHO Yellow   | RICHO | location 4 |
+------------+--------------+-------------+----------------+-------+------------+

秒table

+-----------+------------+--------------+-------------+----------+--------+
| record_id | product_id | product_code | part_number | quantity | in_out |
+-----------+------------+--------------+-------------+----------+--------+
|         1 |          1 | 100100       | 100200      |       10 |      1 |
|         2 |          1 | 100100       | 100200      |       10 |      1 |
|         3 |          1 | 100100       | 100200      |       30 |      1 |
|         4 |          2 | 1112211      | 100300      |       10 |      1 |
|         5 |          2 | 1112211      | 100300      |       10 |      1 |
|         6 |          2 | 1112211      | 100300      |       10 |      1 |
|         7 |          2 | 1112211      | 100300      |       10 |      1 |
|         8 |          3 | 111333       | 100400      |       10 |      1 |
|         9 |          3 | 111333       | 100400      |       10 |      1 |
|        10 |          3 | 111333       | 100400      |       10 |      1 |
+-----------+------------+--------------+-------------+----------+--------+

现在我想创建一个 SQL 查询来显示当前数量的所有产品，我没有做到这一点，到目前为止我设法通过这个查询获得了 IN 数量。

SQL 查询计算每个产品的 IN 数量：

select p.product_id,
       p.product_id,
       p.product_code,
       p.product_name,
       SUM(io.quantity) as physical_quantity
       from products as p,
       in_out_products as io where p.product_id=io.product_id and io.deleted_at is null and in_out=1 group by p.product_id;

结果

+------------+------------+--------------+----------------+-------------------+ | product_id | product_id | product_code | product_name | physical_quantity | +------------+------------+--------------+----------------+-------------------+ | 1 | 1 | 100100 | RICHO maginate | 50 | | 2 | 2 | 1112211 | RICHO Cyan | 40 | | 3 | 3 | 111333 | RICHO Yellow | 30 | +------------+------------+--------------+----------------+-------------------+

Answer 1

如果没记错你需要使用Conditional Aggregate

select p.product_id,
       p.product_id,
       p.product_code,
       p.product_name,
       SUM(io.quantity) as physical_quantity,
       SUM(case when in_out=1 then io.quantity else 0 END) - 
       SUM(case when in_out=0 then io.quantity else 0 END) AS Difference
from products as p 
Join in_out_products as io 
on p.product_id=io.product_id 
Where io.deleted_at is null 
and in_out=1 
group by p.product_id;

如何通过计算IN和OUT之差来计算物理量

How to calculating physical quantity by calculating the difference between IN and OUT

mysql

sql

database

innodb

join