Average predicate value

Users Dgraph
1

I have dt_duration predicates in my data and I want to calculate the average duration from all my data. when I passed dt_duration to function avg doesn’t work for me so I think about this solution

 {
  var(func:has(dt_evt_name)) {
    c as count(uid)
    d as dt_duration
    
  }
 dt(){
    dr as sum(val(d))
    average as math(dr/c)
}
  q(func: has(dt_evt_name),orderdesc: val(average)){
   dtt : val(average)
  }    
}

I get error “message”: “: Wrong types 2, 0 encontered for func /” can anyone help to get the right code for this feature

2

I think there is no problem with this DQL, but there is only one average value, so there should be no sorting.

 {
  var(func:has(dt_evt_name)) {
    c as count(uid)
    d as dt_evt_name
  }
  var(){
    dr as sum(val(d))
  }
  q(){
    dtt : math(dr/c)
  }    
}