Creating Stored Procedures and joining tables - mysql

Question

I am using a database called salesshort used mostly for learning MySQL. I am trying to create a stored procedure but for some odd reason when I run my code is not even creating the store procedure I think my syntax is wrong.
here are the instructions and my code.
Create a stored procedure ‘gbSaleP’ that returns the following ‘order types’:
"we are loosing money" if the actual profit for each order (i.e., OrderNumber)- is lower than or equal to zero; "good sale" if the difference between potential profit and actual profit is $2500 or lower; and
"bad sale" if the difference between potential profit and actual profit is greater than $2500.
delimiter //
create procedure gbSaleP ( in orderNumber int(10), out SaleStatus varchar (40))
begin
set gbsaleP = (select sum(o.quantityOrdered*p.MSRP - o.quantityOrdered*p.buyPrice) - abs(sum(o.quantityOrdered*o.priceEach - o.quantityOrdered*p.buyPrice))
from orderdetails as o
join products as p
using(productCode)
group by orderNumber
having porderNumber = orderName);
if gbSaleP <= 2500 then set SalesStatus = "good sale"
elseif gbSaleP => 2500 then set SaleStatus = "bad sale"
else set gbSaleP = "unknown"
end if;
end;
delimiter //

Answer 1

If your amount calculation script is right, you may use below.
DELIMITER //
CREATE procedure gbSaleP (IN orderNumber int(10), OUT SaleStatus varchar (40))
BEGIN
DECLARE amount DECIMAL(20,2);
set amount = (/*.......Correct SQL script*/);
if amount <= 2500 then
set SaleStatus = 'good sale';
elseif amount > 2500 then
set SaleStatus = 'bad sale';
else
set SaleStatus = 'unknown';
end if;
END; //
DELIMITER ;
You can test it with:
CALL `gbSaleP` (7, #`SaleStatus`);
SELECT #SaleStatus;