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of course, doh! what was I thinking - sorry
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of course, doh! what was I thinking - sorry

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I am getting error &quot;datatype nvarchar(max) is invalid for sum...&quot;. &nbsp;<br />
<br />
SELECT SUM([ProductTaxonomy.csv].<wbr />[YTD Sales Amount])<br />
FROM [ProductTaxonomy.csv]<br />
WHERE NOT EXISTS<br />
(SELECT [Product Management.csv].[Product_C<wbr />ode] FROM [Product Management.csv] WHERE [ProductTaxonomy.csv].[Pro<wbr />duct Code] = [Product Management.csv].[Product_C<wbr />ode])
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I am getting error "datatype nvarchar(max) is invalid for sum...".  

SELECT SUM([ProductTaxonomy.csv].[YTD Sales Amount])
FROM [ProductTaxonomy.csv]
WHERE NOT EXISTS
(SELECT [Product Management.csv].[Product_Code] FROM [Product Management.csv] WHERE [ProductTaxonomy.csv].[Product Code] = [Product Management.csv].[Product_Code])

SQL Server Select SUM

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.