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      Find Nodes

      Query find().nodes() can apply filters on nodes and return those that meet the requirement. This is very similar to table query in traditional database.

      Syntax:

      • Statement alias: supported (NODE)
      • Prefix: OPTIOANL (returns null for any subquery that finds no result)
      • Optional parameters:
      Parameter Type Specification Description Structure of Custom Alias
      limit() Int -1 or >=0 Number of results to return for each subquery, -1 means to return all results Not supported

      An alias nodes will be automatically defined by system when there is no manually defined alias at the end of the node query statement; in this case user cannot use nodes to define alias for other data in the subsequent UQL statement, otherwise error of duplicated name will be triggered.

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

      Run below UQLs one by one in an empty graphset to create graph data:

      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]"}])
      

      No Filter

      Example: Find any node, carry all properties

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

      |--------------- @professor --------------|
      |  _id  | _uuid |  age  |       email     |
      |-------|-------|-------|-----------------|
      | P001  |   1   |  53   | [email protected]   |
      | P002  |   2   |  27   | [email protected] |
      
      |---------------- @student ---------------|
      |  _id  | _uuid |  age  |       email     |
      |-------|-------|-------|-----------------|
      | S001  |   3   |  27   | [email protected]   |
      | S002  |   4   |  20   | [email protected]     |
      | S003  |   5   |  25   | [email protected]  |
      

      Filter ID

      Example: Find node with _id S001, carry all properties

      find().nodes({_id == "S001"}) as n
      return n{*}
      

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

      Example: Find nodes with _uuid 1 or 3, carry all properties

      find().nodes([1,3]) as n
      return n{*}
      

      |--------------- @professor --------------|
      |  _id  | _uuid |  age  |       email     |
      |-------|-------|-------|-----------------|
      | P001  |   1   |  53   | [email protected]   |
      
      |---------------- @student ---------------|
      |  _id  | _uuid |  age  |       email     |
      |-------|-------|-------|-----------------|
      | S001  |   3   |  27   | [email protected]   |
      

      Filter Schema

      Example: Find nodes of @student, carry all properties

      find().nodes({@student}) as n
      return n{*}
      

      |---------------- @student ---------------|
      |  _id  | _uuid |  age  |       email     |
      |-------|-------|-------|-----------------|
      | S001  |   3   |  27   | [email protected]   |
      | S002  |   4   |  20   | [email protected]     |
      | S003  |   5   |  25   | [email protected]  |
      

      Filter Property

      Example: Find nodes with age greater than 25, carry all properties

      find().nodes({age > 25}) as n
      return n{*}
      

      |--------------- @professor --------------|
      |  _id  | _uuid |  age  |       email     |
      |-------|-------|-------|-----------------|
      | P001  |   1   |  53   | [email protected]   |
      | P002  |   2   |  27   | [email protected] |
      
      |---------------- @student ---------------|
      |  _id  | _uuid |  age  |       email     |
      |-------|-------|-------|-----------------|
      | S001  |   3   |  27   | [email protected]   |
      

      Filter Schema & Property

      Example: Find nodes of @student with age greater than 25, carry all properties

      find().nodes({@student.age > 25}) as n
      return n{*}
      

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

      limit()

      Example: Find 3 nodes, carry all properties

      find().nodes().limit(3) as n
      return n{*}
      

      |--------------- @professor --------------|
      |  _id  | _uuid |  age  |       email     |
      |-------|-------|-------|-----------------|
      | P001  |   1   |  53   | [email protected]   |
      | P002  |   2   |  27   | [email protected] |
      
      |---------------- @student ---------------|
      |  _id  | _uuid |  age  |       email     |
      |-------|-------|-------|-----------------|
      | S001  |   3   |  27   | [email protected]   |
      

      Default Statement Alias

      Example: Find 3 nodes, carry all properties

      find().nodes().limit(3)
      return nodes{*}
      

      |--------------- @professor --------------|
      |  _id  | _uuid |  age  |       email     |
      |-------|-------|-------|-----------------|
      | P001  |   1   |  53   | [email protected]   |
      | P002  |   2   |  27   | [email protected] |
      
      |---------------- @student ---------------|
      |  _id  | _uuid |  age  |       email     |
      |-------|-------|-------|-----------------|
      | S001  |   3   |  27   | [email protected]   |
      

      OPTIONAL

      Example: Find nodes with age greater than 55, carry all properties; return null if no result

      optional find().nodes({age > 55}) as n
      return n{*}
      

      null
      

      Analysis: This query will give no return if not using OPTIONAL.

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