ObjectGears

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We need to do a complex report with several tables. At this moment we use a stored procedure for that where we create a temporary table which we fill in several steps. Is it also possible in ObjectGears?

You can use whatever SQL Server possibilities for SELECT statement in the query or you can call a stored procedure. You can find more information here
http://doc.objectgears.cz/Help.aspx?H=a_data_query_sp