Neo4j

lingvisa · 12-08-2022

I usually use: match (n) detach delete n Even for a small graph, this usually takes a long time. Is there a better way to delete the graph using cypher?

lingvisa · 11-22-2022

MATCH p=()-[r:coOccur]->() WHERE r.confidence>0.9 RETURN p limit 25 I have a graph that have all Tag nodes and their coOccur relationship. The coOccur has a property confidence which has value between 0 and 1. However, my query above also returns r...

lingvisa · 11-12-2022

CALL apoc.periodic.iterate("CALL apoc.load.csv('/Users/martin/test/test.csv', {nullValues:['','na','NAN',false], sep:' ' }) yield map as row", "MERGE (mGenerics {nid: row.nid})ON CREATE SET m += row ON MATCH SET m += row RETURN count(m) as mcount", ...

lingvisa · 10-24-2022

MATCH (m:Sports)-[r:hasPlayer]-(n:Sports) RETURN properties(n) as properties1, properties(m) as properties2 limit 100000 This takes quite a while to complete given around 50000 Sports node. I hope it can be finished under one 1 second, since it's...

lingvisa · 11-30-2021

CALL apoc.periodic.iterate( "MATCH (n:Article) return n.nid", "REMOVE n.bertEmbedding", {batchSize:30000, parallel:false, iterateList:true}) The error message: org.neo4j.graphdb.QueryExecutionException: Variable n not defined (line 1, column 65 (...

lingvisa · 12-11-2022

Actuall, this worked: return session.run('CALL apoc.periodic.iterate("MATCH (n) RETURN n","DETACH DELETE n", {batchSize:1000, parallel:false})')

lingvisa · 12-11-2022

Can you give an example of how to use :auto or apoc.periodic.iterate() to delete the whole graph? (Match(n) DETACH DELETE N)

lingvisa · 12-09-2022

Originally, I used "Match (n) DETACH DELETE n", which is a performance issue. But now per documentation suggestion, I used: with self.neo4j_driver.session() as session: session.write_transaction(lambda tx: tx.run('MATCH (n) CALL { WITH n DETACH DELET...

lingvisa · 12-09-2022

@dana_canzano @dana_canzano I am using Neo4j Community 4.4.12. I am uisng the Python driver to access the graph, and the code is: with self.neo4j_driver.session() as session: session.write_transaction(lambda tx: tx.run('MATCH (n) CALL { WITH n DETAC...

lingvisa · 12-09-2022

Test

Neo4j

User Statistics

User Activity

What's the best cypher command to delete the whole graph?

Why does this relationship query return results that don't meet condition?

Why parallel:true can't be used in apoc.load.csv?

Is it possible to speed up relationship queries?

Why is this query invalid?

Re: What's the best cypher command to delete the whole graph?

Re: What's the best cypher command to delete the whole graph?

Re: What's the best cypher command to delete the whole graph?

Re: What's the best cypher command to delete the whole graph?

Re: What's the best cypher command to delete the whole graph?