As you may know, you can do SQL queries in FileMaker with MBS Plugin and than get result stored in memory to call other functions on that.

We got a few new functions for this: FM.SQL.Max, FM.SQL.Min, FM.SQL.Avg and FM.SQL.Sum

So you can do a query once and than let the plugin sum up the values or calculate an average on a subset of the result. You can specify column and first/last row to use.

# let FileMaker query data once

Set Variable [ $Records ; Value: MBS( "FM.SQL.Execute"; Get(FileName); "SELECT Price FROM Produkte") ] 

# Now get sum, min, max and avg

Set Variable [ $sum ; Value: MBS( "FM.SQL.Sum"; $records; 0) ] 

Set Variable [ $min ; Value: MBS( "FM.SQL.Min"; $records; 0) ] 

Set Variable [ $max ; Value: MBS( "FM.SQL.Max"; $records; 0) ] 

Set Variable [ $avg ; Value: MBS( "FM.SQL.Avg"; $records; 0) ] 

Set Variable [ $text ; Value: MBS( "FM.SQL.Text"; $records; "" /* firstRow */; "" /* lastRow */; "" /* firstCol */; "" /* lastCol */; ", " /* rowSep */) ] 

Set Variable [ $r ; Value: MBS( "FM.SQL.Release"; $records ) ] 

Show Custom Dialog [ "Sum: " & $sum & ¶ & "Min: " & $min & ¶ & "Max: " & $max & ¶ & "Avg: " & $avg & ¶ & "text: " & $text ]