计算两个MySQL表之间的数量

Question

I have two tables one for incoming goods and inventory and another for the exit of products.

How do I do a select in mysql to return the amount available in stock without using PHP.

In the case would STOCK - OUTPUTS.

Thanks!

Answer 1

I think you want something like this:

SELECT 
(SELECT SUM(quantity) FROM stock) - 
(SELECT SUM(quantity) FROM outputs) AS 'slo'