日期
where     SellDate   > =     cast((@Year   +   '- '   +   @Month   +   '- '   +   @Day   )   as   nvarchar)
帮我看看这个怎么不行啊

------解决方案--------------------
where SellDate > = cast(@Year as nvarchar)+ '- '+cast(@Month as nvarchar)+ '- '+cast(@Day as nvarchar)