SQL ROUND（）函数问题

Question

I have tried to use round function to convert for example 348.426580 to 348.43
But in below query I used the result I got is 348.430000 in [ShippingCost] column

How can I omit the four zeros?

SELECT  S.Product_Name, 
        SPD.UnitPrice, 
        SPD.Quantity, 
        SPD.Quantity * SPD.UnitPrice Amount,
        CONVERT(INT,(SPD.Quantity * SPD.UnitPrice)/(SUM(SPD.Quantity * SPD.UnitPrice) OVER()) * 100) [Cost %],
        ROUND((SPD.Quantity * SPD.UnitPrice)/(SUM(SPD.Quantity * SPD.UnitPrice) OVER()) * Sp.Shipping_Cost,2) [ShippingCost],
        (SPD.Quantity * SPD.UnitPrice)/(SUM(SPD.Quantity * SPD.UnitPrice) OVER()) * Sp.Customs_Cost [CustomsCost],
        (SPD.Quantity * SPD.UnitPrice)/(SUM(SPD.Quantity * SPD.UnitPrice) OVER()) * Sp.Shipping_Cost + (SPD.Quantity * SPD.UnitPrice)/(SUM(SPD.Quantity * SPD.UnitPrice) OVER()) * Sp.Customs_Cost +SPD.Quantity * SPD.UnitPrice - SpD.Discount [TotalAmount]
FROM dbo.Stock_Purchase SP
INNER JOIN dbo.Stock_Purchase_Details SPD
    ON SP.Purchase_ID = SPD.Purchase_ID 
INNER JOIN dbo.Store S
    ON SPD.Pro_ID = S.Pro_ID;

Answer 1

You can cast to a decimal, say DECIMAL(10, 2) . Because casting automatically does rounding, there is no need for round() :

    CAST((SPD.Quantity * SPD.UnitPrice)/(SUM(SPD.Quantity * SPD.UnitPrice) OVER()) * Sp.Shipping_Cost as decimal(10, 2)) as [ShippingCost],

Answer 2

ROUND(column_name,decimals)

column_name Required for The field to round.

decimals Required for Specifies the number of decimals to be returned.

See this.