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v5.0
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    v5.0

      UNION

      Overview

      The UNION statement combines results of two or more queries into a single result set that includes the distinct records present in any of the query. When multiple return items are involved, the combination of their values is unique.

      To keep all the records without deduplication, use the UNION ALL statement.

      Syntax

      ...
      return <item1> as <alias1?>, <item2?> as <alias2?>, ...
      union
      ...
      return <item1> as <alias1?>, <item2?> as <alias2?>, ...
      

      Details

      • The return items in all queries combined by UNION must be identical.

      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("takes")
      create().node_property(@*, "name").node_property(@student, "age", int32).node_property(@course, "credits", int32)
      insert().into(@student).nodes([{_id:"S1", name:"Jason", age:25}, {_id:"S2", name:"Lina", age:23}, {_id:"S3", name:"Eric", age:24}, {_id:"S4", name:"Emma", age:26}, {_id:"S5", name:"Pepe", age:24}])
      insert().into(@course).nodes([{_id:"C1", name:"French", credits:4}, {_id:"C2", name:"Math", credits:5}])
      insert().into(@takes).edges([{_from:"S1", _to:"C1"}, {_from:"S2", _to:"C1"}, {_from:"S3", _to:"C1"}, {_from:"S2", _to:"C2"}, {_from:"S3", _to:"C2"}, {_from:"S4", _to:"C2"}, {_from:"S5", _to:"C2"}])
      

      Combining Queries

      n({@course.name == "French"}).e().n({@student} as s) return s.name
      union
      n({@course.name == "Math"}).e().n({@student} as s) return s.name
      

      Result:

      s.name
      Lina
      Eric
      Jason
      Emma
      Pepe
      n({@course.name == "French"} as c).e().n({@student} as s) return c.name, s.age 
      union
      n({@course.name == "Math"} as c).e().n({@student} as s) return c.name, s.age
      

      Result:

      c.name s.age
      French 23
      French 24
      French 25
      Math 23
      Math 26
      Math 24
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