CSV – row values concatenation (FOR XML PATH) and exporting column values to a MS Excel file (Microsoft.Jet.OLEDB)

Task: to create row values concatenation, i.e. CSV (Comma Separated Values), by means of the FOR XML PATH construction, and to export database table column values to the MS Excel file using the Microsoft.Jet.OLEDB ad hoc method of connecting and accessing remote data by using OLE DB Solution: see Source code 1 – 4 EXEC [...]