• Expression: !<exp>
• Operand: expression (true, false)

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:"test@yahoo.cn"},{_id:"P002",_uuid:2,age:27,email:"test@ultipa.com"}])
insert().into(@student).nodes([{_id:"S001",_uuid:3,age:27,email:"test@yeah.net"},{_id:"S002",_uuid:4,age:20,email:"test@w3.org"},{_id:"S003",_uuid:5,age:25,email:"test@gmail.com"}])

Common Usage

Example: Find nodes of @student, whose age is not 27

find().nodes({@student && !(age==27)}) as n
return n{*}

|---------------- @student ---------------|
|  _id  | _uuid |  age  |       email     |
|-------|-------|-------|-----------------|
| S002  |   4   |  20   | test@w3.org     |
| S003  |   5   |  25   | test@gmail.com  |

Analysis: This filter cannot be composed as {!(@student.age == 27)}, which is equivalent to {!@student || !(age == 27)} and outputs:

|--------------- @professor --------------|
|  _id  | _uuid |  age  |       email     |
|-------|-------|-------|-----------------|
| P001  |   1   |  53   | test@yahoo.cn   |
| P002  |   2   |  27   | test@ultipa.com |

|---------------- @student ---------------|
|  _id  | _uuid |  age  |       email     |
|-------|-------|-------|-----------------|
| S002  |   4   |  20   | test@w3.org     |
| S003  |   5   |  25   | test@gmail.com  |