Fonction intersection() calcule les éléments communs de deux lists et les retourne sous forme d'une nouvelle list, c'est-à-dire, retourne l'intersection de ces deux lists (les éléments répétés sont autorisés dans l'intersection).

Arguments：

• 1ère liste <list>
• 2ème liste <list>

Renvoie：

• Intersection <list>

Usage Commun

Exemple : Calcul direct

uncollect [[1,2,2],[2,4,5]] as a
uncollect [[2,4,7],[4,5,7]] as b
return table(toString(a), toString(b), toString(intersection(a, b)))

| toString(a) | toString(b) | toString(intersection(a, b)) |
|-------------|-------------|------------------------------|
| [1,2,2]     | [2,4,7]     | [2]                          |
| [2,4,5]     | [4,5,7]     | [4,5]                        |

Exemple : Multiplier et calculer

uncollect [[1,2,2],[2,4,5]] as a
uncollect [[2,4,7],[4,5,7]] as b
with intersection(a, b) as c
return table(toString(a), toString(b), toString(c))

| toString(a) | toString(b) | toString(c) |
|-------------|-------------|-------------|
| [1,2,2]     | [2,4,7]     | [2]         |
| [1,2,2]     | [4,5,7]     | []          |
| [2,4,5]     | [2,4,7]     | [2,4]       |
| [2,4,5]     | [4,5,7]     | [4,5]       |

Graphique d'exemple : (à utiliser pour les exemples suivants)

create().node_schema("student").node_schema("course")
create().node_property(@*, "name").node_property(@student, "age", int32).node_property(@course, "credit", int32)
insert().into(@student).nodes([{_id:"S001", _uuid:1, name:"Jason", age:25}, {_id:"S002", _uuid:2, name:"Lina", age:23}, {_id:"S003", _uuid:3, name:"Eric", age:24}, {_id:"S004", _uuid:4, name:"Emma", age:26}, {_id:"S005", _uuid:5, name:"Pepe", age:24}])
insert().into(@course).nodes([{_id:"C001", _uuid:6, name:"French", credit:4}, {_id:"C002", _uuid:7, name:"Math", credit:5}])
insert().into(@default).edges([{_uuid:1, _from_uuid:1, _to_uuid:6}, {_uuid:2, _from_uuid:2, _to_uuid:6}, {_uuid:3, _from_uuid:3, _to_uuid:6}, {_uuid:4, _from_uuid:2, _to_uuid:7}, {_uuid:5, _from_uuid:3, _to_uuid:7}, {_uuid:6, _from_uuid:4, _to_uuid:7}, {_uuid:7, _from_uuid:5, _to_uuid:7}])

Exemple : Trouver les étudiants qui choisissent à la fois le Français et les Mathématiques

khop().src({name == "French"}).depth(1) as n1
with collect(n1) as l1
khop().src({name == "Math"}).depth(1) as n2
with collect(n2) as l2
return intersection(l1, l2)

[
  {"id":"","uuid":"2","schema":"student","values":{}},
  {"id":"","uuid":"3","schema":"student","values":{}}
]