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我已经编写了一条sql语句,用于从特定表中选择列。然而,我遇到的问题是,能够在中间名列中显示数据,我不希望发生这种情况。尝试使用select放入null和算术运算。SELECT First_Name, Surname, Middle_Name as null, (Price_Per_Unit * Quantity) + Vat + Discount AS Total_Cost FROM In