Sorted difference between two columns

问题

I have two columns (buying prince and sale price) and I want to calculate the difference between them. After that I want to order the result so I can see all the profit margins.

Can I do it with just one SELECT statement?

Thanks!

回答1:

  SELECT (sale_price - buy_price) AS profit
    FROM table_name
ORDER BY profit DESC

回答2:

Joe has it, but I think you might be looking for something slightly different for the ordering.

Profit margin is defined as net income / revenue.. so the profit margin of each product would be (sale_price minus buy price) divided by sale_price.

SELECT (sale_price - buy_price) AS profit FROM table_name 
ORDER BY ((sale_price - buy_price) / sale_price) DESC

Good luck.

来源：https://stackoverflow.com/questions/7379423/sorted-difference-between-two-columns