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Select count(*) as AnzahlMountainbikes from Fahrraeder where fahrradart = "Mountainbike";
Select max(Anschaffungswert) as HöchsterAnschaffungswert from Fahrraeder;
Select truncate(avg(tagesmietpreis),2) from fahrraeder;
Select sum(anschaffungswert) from Fahrraeder;
Select fahrradnr,Fahrradart,truncate(tagesmietpreis*7*0.7,0) as Wochenmietpreis from Fahrraeder where Fahrradart = "Rennrad" or Fahrradart = "Mountainbike";
Select fahrradnr,Fahrradart,Kaufdatum,concat(year(now())-year(Kaufdatum)) as Jahrealt,year(kaufdatum) as Berechnungsjahr from fahrraeder;