Comparison 2 columns to find the remaining quantity

Hello to all the community, we have created an application that receives orders and sales, we have 2 tables, 1 table is order(barcode,quantity,id) and we have a second table sales(barcode,quantity,id).I want to create a comparison between these two tables and show me a list of products  that have not been sold, and the remaining quantity.For the first problem, I found the solution with select,(thank you @TeeSee1 )

SELECT(
 order[barcode],
 [id] = [_thisrow].[id]
)
- 
SELECT(
 sales[barcode],
 [id] = [_thisrow].[id]
)

but I can't find anything similar to show me exactly the remaining quantity!When I use something similar and for the quantity with select I just get a number and not the product and the exact number with the remaining products!

please help @Steve , @TeeSee1,  @Joseph_Seddik

 

 

 

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