fla1=db.flavor.with_alias('fla1')
fla2=db.flavor.with_alias('fla2')
r=db().select(db.ice_cream.id,fla1.name,fla2.name,
  left=[fla1.on(db.ice_cream.f1==fla1.id),
        fla2.on(db.ice_cream.f2==fla2.id)])



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