SQL列类型不匹配错误

Question

我知道为什么我的列类型不匹配[Analysis.ASCo]＆＃39;这里？光标突出显示第二个分析＆＃39;在第5行。

select
[Analysis].[Project],
[Analysis].[Borehole],
[Analysis].[Depth],
([Analysis].[ASCu]+(([Analysis].[ASCo]*30500)/5630)) as [Equivalent],
[Nama C Boreholes].[Elevation],
([Nama C Boreholes].[Elevation]-[Analysis].[Depth]) as [Sample_Elevation]
from
[Analysis]
inner join [Nama C Boreholes]
on [Analysis].[Project]=[Nama C Boreholes].[Project]
and [Analysis].[Borehole]=[Nama C Boreholes].[Borehole]