从不同的表中减去两列并更新库存

Question

I need to update the product quantity in store inventory table based on quantity sold in SALELINE table

so, I want to subtract QTYONHAND from Store_inv and QTYSOLD from SALELINE table for each product which has a Product_id

Store_inv and SALELINE both has a Product_id as (FK)

Answer 1

I didn't clear what data you have in table.Based on your question assumption
I posted below query.First Subtract qty from two tables using subquery than update inventory table

UPDATE store_inventory SET product_quantity = A.SubQty
FROM 
(
   SELECT ( QTYONHAND - QTYSOLD ) SubQty,SALELINE.Product_id AS Product_id
   FROM Store_inv
   JOIN SALELINE ON Store_inv.Product_id = SALELINE.Product_id
) A 
WHERE A.Product_id = store_inventory.Product_id

Answer 2

https://www.codeproject.com/questions/555388/howplustoplussubtractplustwoplusvaluesplusinplussq

refer this page you will get some idea

Answer 3

Try this:

UPDATE SALELINE s
INNER JOIN store_inv si ON s.product_id = si.product_id
SET s.product_quantity = (si.QTYONHAND-s.QTYSOLD)