Equal

• Expression: <value1> == <value2>
• Operand: number, time, string

Constant

Example: Judge whether "Ultipa" equals "U1tipa"

UQL
return "Ultipa" == "U1tipa"

Result
0

Function

Example: Judge whether PI equals 3

UQL
return pi() == 3

Result
0

Alias

Example: Judge each row of an alias whether it equals 2

UQL
uncollect [1,2,3,2,2] as a
return a == 2

Result
0
1
0
1
1

Sample graph: (to be used for the following examples)

Run below UQLs one by one in an empty graphset to create graph data: ```customlang___fold__lang_uql 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]"}]) ```

Property

Example: Find nodes whose age is 27

UQL
find().nodes({age == 27}) as n
return n{*} 

Result
|--------------- @professor --------------|
|  _id  | _uuid |  age  |       email     |
|-------|-------|-------|-----------------|
| P002  |   2   |  27   | [email protected] |

|---------------- @student ---------------|
|  _id  | _uuid |  age  |       email     |
|-------|-------|-------|-----------------|
| S001  |   3   |  27   | [email protected]   |

Example: Find nodes of @professor, whose age is 27

UQL
find().nodes({@professor.age == 27}) as n
return n{*} 

Result
|--------------- @professor --------------|
|  _id  | _uuid |  age  |       email     |
|-------|-------|-------|-----------------|
| P002  |   2   |  27   | [email protected] |

_uuid (Abbreviated)

When a filter only judges whether the _uuid of the current node/edge equals an integer, the filter can be abbreviated as below:

Example: Find node with _uuid 1

UQL
find().nodes(1) as n
return n{*} 

Result
|--------------- @professor --------------|
|  _id  | _uuid |  age  |       email     |
|-------|-------|-------|-----------------|
| P001  |   1   |  53   | [email protected]   |