Division in Firebird SQL Abfrage

[mkinzler]

Versuch mal

SQL-Code:

...
 Cast((select Cast(Count(VVI.Counter)as Numeric(15,2))
          From Vor_Vorgang VVI
          Where VVI.Vorgangsart = 30 and VVI.Kontakt = VV.Kontakt
           and VVI.DATUM >=:Z1 AND VVI.DATUM <=:Z2)

           / <<<< Hier die Division

       (select Cast(Count(VVI.Counter)as Numeric(15,2))
         From Vor_Vorgang VVI
         Where VVI.Vorgangsart = 20 and VVI.Kontakt = VV.Kontakt
          and VVI.DATUM >=:Z1 AND VVI.DATUM <=:Z2) as Numeric(15,2)) 
...