I want to query and calculate the cumulative sum of a certain predicate，for example, I want to obtain the age and。

{

result(func: type(Person)){

age

}

}

I want to query and calculate the cumulative sum of a certain predicate，for example, I want to obtain the age and。

{

result(func: type(Person)){

age

}

}

I have tried sum, but this can only calculate the value of count()

eg:

{

result(func: type(Person)){

v as count(age)

}

me(){

sum(val(v))

}

}

You can sum without using `count()`

:

```
{
var(func: type(Person)){
v as age
}
x(){
sum(val(v))
}
}
```

Thank you very much. I found that the field type I used earlier was incorrect