I have seen different versions of "linking" in Cypher for example:
match (n)-[r]-() delete, n, r
merge (n) -[:TO {dist:line.distance}] -> (m)
match (n:MyNode)-[r:TO]->(m) where not ((m)-->())
where these links can be assigned using 1) "-", 2) "->" 3) "-->", I was wondering what the difference between these three types are. In these different contexts, I see that they are used differently but was wondering if there was a general rule for understanding this.
(n)-[r]-()
means that you do not care about the directionality of the relationship r
.
(n)-[r]->(m)
means that the relationship r
must be directed from n
to m
.
(n)-->(m)
means that you do not want to qualify the relationship pattern (e.g., specify a type) nor get any data from the relationship via an identifier (e.g., r
).
You can read the documentation to get more informtion.
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