Aggregations
An aggregate function in GQL performs a calculation on multiple values and returns a single value
Aggregation max
Accept field name to calculate the maximum value of it for all elements until the current one
Aggregation min
Accept field name to calculate the minimum value of it for all elements until the current one
Aggregation sum
The function sum() is an aggregate function that returns the sum of items in a group
Aggregation avg
The function avg() is an aggregate function that returns the average values of items in a group
Aggregation count
The function count() is an aggregate function that returns the number of items in a group