Function count() calculates the number of rows 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 <any>
Returns：
- Number of Rows <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 number of all nodes in the graph
find().nodes() as n
return count(n)
5