Question

我需要这个问题的帮助。。编写一个包含一行输出的脚本，该输出显示“三月销售额大于四月销售额”或“四月销售额大于三月销售额”，具体取决于哪个是真的。您需要总结销售额（将其视为文法价格减去当月销售额的折扣），然后使用if / else。所以我想这样做

Use MyGuitarShop;

DECLARE @AprilSales MONEY;
DECLARE @MarchSales MONEY;

SET @AprilSales = (SELECT MONTH(Orders.OrderDate) as SalesMonth,
         SUM(OrderItems.ItemPrice-OrderItems.DiscountAmount) AS    TotalSales
FROM Orders,OrderItems
 WHERE MONTH(Orders.OrderDate) = 4
GROUP BY MONTH(Orders.OrderDate));

SET @MarchSales = (SELECT MONTH(Orders.OrderDate) as SalesMonth,
     SUM(OrderItems.ItemPrice-OrderItems.DiscountAmount) AS TotalSales
FROM Orders,OrderItems
WHERE MONTH(Orders.OrderDate) = 3
GROUP BY MONTH(Orders.OrderDate));

SELECT @AprilSales, @MarchSales
FROM Orders, OrderItems 
 IF @AprilSales > @MarchSales 
    BEGIN
        PRINT 'April sales are greater than March sales.'
END;
 ELSE --@MarchSales > @AprilSales
    PRINT 'March sales are greater than April sales.';

但是我得到了这个错误

当EXISTS未引入子查询时，只能在选择列表中指定一个表达式。

有问题的Exsist

0 个答案: