【Sql Server】不能子表达式加convert-decimal，会导致外层四舍五入

[全栈小5]

1、四舍五入效果

select (4-4*0.006)*0.9*0.4
select (
    case when 1=1 then
        convert(decimal(18,6),(8-8*0.006)*0.9*0.4)
    else
        0
    end
) as newTest