MYSQL凡總和（tabl1.column_name）<tabl2.other_column

Question

我有兩個表的產品和sold_products

products -> id|name|quantity|price 
sold_products -> id|product_id|quantity 

我需要的是從sold_products計算量的總和，並檢查總和大於數量較大從產品表。像下面的東西;

select p.* from products as p and sold_products as sp where p.quantity > sum(sp.quantity) 

在此先感謝;

Answer 1

您可以通過join 2表使這和使用having與group by：

select p.quantity, sum(sp.quantity) 
from products as p 
inner join sold_products as sp 
on p.id = sp.product_id 
group by p.id 
having p.quantity < sum(sp.quantity) 

Answer 2

Group BY與HAVING將工作。

SELECT p.* 
FROM products AS p, sold_products AS sp 
WHERE p.id = sp.product_id 
GROUP BY p.id 
HAVING sum(sp.quantity) > p.quantity 

Answer 3

也工作

select p.id,p.quantity, sum(sp.quantity) from products1 as p inner 
join sold_products as sp on p.id = sp.product_id group by p.id 
having sum(p.quantity) < sum(sp.quantity) 

但@豪達Elalfy PLZ告訴我回答這個