I have the datagridview of USERS table on the form. I add query to new column, and create scalar query for added column like this: 

 and receive this error:

the scema returned by the new query differs from the base query

This query calculates records from a view named vw_reception, but there are no any componet like dataadapter or datagridview for this view on the form.

Hi Mirage_sk,

Thanks for providing the sql script. Could you please provide more information or a code snippet about how you use this sql?
From my experience, the cause of the error you mentioned is that the select outputs are not the same. You need to check the returnd column name of the select sql.
This is a similar thread: http://social.msdn.microsoft.com/Forums/en-US/adodotnetdataproviders/thread/0b6546e2-754b-4398-9e43-5a30545d13e0

Regards,
Aland Li

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