Hello Piotr,
As far as I know that you can't use SQL Script directly for the data-source in data-driven web test. You can consider submit one feature request on the Microsoft Connect site here:
http://visualstudio.uservoice.com/forums/121579-visual-studio
And for your issue, I think you need to get the data in the SQL Server with the correct order first and save it as a XML, csv, Excel file or just save it in another table, and then use the new created file or table as data-source in the data-driven
web test. You can create a web test plug-in to do the work for you. For more information about web test plug-in, see:
http://msdn.microsoft.com/en-us/library/ms243191.aspx
Thanks.
Vicky Song [MSFT]
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