It may help to start out with an example based on your data. I'm guessing at what your data model might look like, but try these in an empty neo4j database. I used neo4j desktop to create an empty graph db.
// create the first relationship
create p=(:person {name:'ABC'})-[:ATTENDING]->(:college {name:'clg1'})
return p
// create the second relationship
create p=(:person {name:'BCD'})-[:ATTENDING]->(:college {name:'clg2'})
return p
// return all people and the college they are attending
match p=(a:person)-[:ATTENDING]->(b:college)
return p
// add another person 'me' ATTENDING clg2 (an existing college)
Match (b:college {name:'clg2'})
CREATE p=(a:person {name:'me'})-[:ATTENDING]->(b)
return p
// return all people and the college they are attending, again to see there are now two people attending clg2
match p=(a:person)-[:ATTENDING]->(b:college)
return p
notes
- this is a trivial example to get you started
- the third CREATE cypher demonstrates finding an exist node in the graph before creating a new relationship to avoid creating a duplicate copy of the college node.
- If you don't know if a node or relationship exists yet, the MERGE command will be useful
