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v5.0
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    v5.0

      WITH

      Overview

      The WITH statement can be used to manipulate the data generated earlier in the query before passing it to subsequent parts. Note that the WITH statement affects the scope of aliases. Any aliases not included in the WITH statement will not be available in the remainder of the query.

      Example Graph

      To create the graph, execute each of the following UQL queries sequentially in an empty graphset:

      create().node_schema("Student").node_schema("Course").edge_schema("Take")
      create().node_property(@Student,"name").node_property(@Student,"gender").node_property(@Course,"name").node_property(@Course,"credit",int32)
      insert().into(@Student).nodes([{_id:"s1", name:"Alex", gender:"male"}, {_id:"s2", name:"Susan", gender:"female"}])
      insert().into(@Course).nodes([{_id:"c1", name:"Art", credit:13}, {_id:"c2", name:"Literature", credit:15}, {_id:"c3", name:"Maths", credit:14}])
      insert().into(@Take).edges([{_from:"s1", _to:"c1"}, {_from:"s2", _to:"c1"}, {_from:"s2", _to:"c2"}, {_from:"s2", _to:"c3"}])
      

      Performing Functions

      To find the courses with the highest credit taken by Susan:

      n({@Student.name == "Susan"} as s).re().n({@Course} as c1)
      with max(c1.credit) as maxCredit
      find().nodes({@Course.credit == maxCredit}) as c2
      return c2.name
      

      Result:

      c2.name
      Literature

      Joining Heterologous Data

      This query checks whether paths exist between each pairing of students and courses in the graph. Note that a Cartesian product is performed between s and c in the WITH statement, resulting in a total of 6 records. The n().e().n() statement then executes six times, processing each record individually. See Heterologous Data for details.

      find().nodes({@Student}) as s
      find().nodes({@Course}) as c
      with s, c
      optional n(s).e().n({_id == c._id}) as p
      return p{*}
      

      Result: p

      Constructing Data

      To find the courses with a credit greater than the target:

      with 13 as target
      find().nodes({@Course.credit > target}) as c
      return c.name
      

      Result:

      c.name
      Literature
      Maths
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