Microsoft Access Domain Aggregate Functions
Microsoft Access Domain aggregate functions differ from aggregate functions in that they total over the whole table that is being queried versus the grouping of data. This is useful for the analysis of the data, especially in forms and reports.
Domain aggregate functions include: DAvg, DCount, DFirst, DLast, DLookUp, DMax, DMin, DStDev, DStDevP, DSum, DVar, and DVarP.