Function sum() sums up the row values in an alias (ignoring the rows that are null). Only one row from the alias will be kept after this function is called, and all the rest rows will be abandoned.
Arguments：
- Alias <number | time>
Returns：
- Sum <number>
Sample graph: (to be used for the following examples)
create().node_schema("professor").node_schema("student")
create().node_property(@*, "age", int32).node_property(@*, "email", string)
insert().into(@professor).nodes([{_id:"P001",_uuid:1,age:53,email:"[email protected]"},{_id:"P002",_uuid:2,age:27,email:"[email protected]"}])
insert().into(@student).nodes([{_id:"S001",_uuid:3,age:27,email:"[email protected]"},{_id:"S002",_uuid:4,age:20,email:"[email protected]"},{_id:"S003",_uuid:5,age:25,email:"[email protected]"}])
Common Usage
Example: Calculate the sum of age of all nodes in the graph
find().nodes() as n
return sum(n.age)
152