Overview

The UNION ALL statement combines results of two or more queries into a single result set that includes all records present in any of the query.

To remove duplicate records during a union operation, use the UNION statement.

Syntax

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

Details

• The return items in all queries combined by UNION ALL 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 all
n({@course.name == "Math"}).e().n({@student} as s) return s.name

Result:

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

Result: