使用sql查詢獲得最大折扣

Question

我的桌子上有很多產品。有些產品有折扣，所以在price_old字段中給出產品的舊價格，並且price字段有新的折扣價格。

是否有可能獲得所有產品，按照price_old和price之間的最大差異（折扣）排列？

Answer 1

你可以這樣做：

SELECT * 
FROM products 
ORDER BY price_old - price DESC 

具有最大price_old - price差的記錄將先返回，接着具有第二最大的區別記錄等

Answer 2

select product,price,price_old 
from table_name 
order by (price_old-price) desc 

Answer 3

我認爲你需要order by biggest discounted product。你需要找到折扣％。

我不覺得覆蓋的場景，所以我在這裏張貼任何一個答案：

SELECT 
    *, 
    ((price_old - price)/price_old)*100 as 'Discount (%)' 
FROM products 
ORDER BY 2 DESC 

Answer 4

可能是你可以使用這樣，看看有多少折扣是

Select *, (price_old-price) as diff from tablename order by diff desc 

Answer 5

select 
    *, old_price-price discount, (old_price-price)/old_price percent 
from 
    product 
order by 
    discount 
desc; 

折扣的地方可以用百分比代替以顯示折扣百分比。