I want to get all nodes information with paths from edge to root node.Using one of the edge property.
This is the three layer node structure.
MATCH (g:GrandChild{name:"C"})<-[:childToGrandChild]-(c:Child)<-[p:Parent*0..]-(c:Child) RETURN c,g,p
This will return only B,C nodes with relationship like this
cypher used
CREATE (p: Parent{name : '1'} ) RETURN p
MATCH (p:Parent) WHERE p.name = '1' CREATE (c: Child{name : '2'} )<-[:parentToChild]-(p) RETURN p
MATCH (c:Child) WHERE c.name = '3' CREATE (g: GrandChild {name : '2'} )<-[:childToGrandChild]-(c) RETURN c
Please help..
You have missed parentTochild relationship which will be like,
MATCH (g:GrandChild{name:"C"})<-[:childToGrandChild]-(c:Child)<-[parentToChild*0..]-(p:Parent)
RETURN c,g,p
Try this :
MATCH (g:GrandChild{name:"C"})<-[:childToGrandChild]-(c:Child)
MATCH (c)<-[p:Parent*0..]-(c2:Child)
RETURN c,c2,g,p
Related
I am new with Neo4j and I am stucked trying to get a query with two conditions, where I want to get all the "Autors" related to "Pixar" and "Fox". So far I have tried the following two ways:
MATCH (a:Autor)- [:AUTOR_DE]-> (t:Título) -[:PRODUCIDO_POR] ->( p:Productora {Nombre: "Pixar"}),
and
MATCH (a:Autor)- [:AUTOR_DE]-> (t:Título) -[:PRODUCIDO_POR] ->( p:Productora {Nombre: "Fox"}),
return a,p
and
MATCH (a:Autor)- [:AUTOR_DE]-> (t:Título) -[:PRODUCIDO_POR] ->( p:Productora)
WHERE ( (p:Productora) = "Fox" OR (p:Productora) = "Pixar")
return a,p
Thanks in advance
Assuming that a Productora node stores its name in a name property, and that every Productora node has a unique name, this should work:
MATCH (a:Autor)-[:AUTOR_DE]->(:Título)-[:PRODUCIDO_POR]->(p:Productora)
WHERE p.name = "Fox" OR p.name = "Pixar"
WITH a, COLLECT(DISTINCT p) AS ps
WHERE SIZE(ps) = 2
return a, ps
And this should also work:
MATCH (fox:Productora), (pixar:Productora), (a:Autor)
WHERE fox.name = "Fox" AND pixar.name = "Pixar" AND
(a)-[:AUTOR_DE]->(:Título)-[:PRODUCIDO_POR]->(fox) AND
(a)-[:AUTOR_DE]->(:Título)-[:PRODUCIDO_POR]->(pixar)
return a, fox, pixar
I'm struggling with problem of creating query in Cypher.
Let's use this graph as an example:
MERGE(a:Person {name:'Alice', age:38, eyes:'brown'})
MERGE(c:Person {name:'Charlie', age:53, eyes:'green'})
MERGE(d:Person {name:'Daniel', age:54, eyes:'brown'})
MERGE(b:Person {name:'Bob', age:25, eyes:'blue'})
MERGE(a)-[:KNOWS]->(c)
MERGE(a)-[:KNOWS]->(b)
MERGE(c)-[:KNOWS]->(d)
MERGE(b)-[:KNOWS]->(d)
I would like to have query that returns me nodes with name = 'Alice' only if there aren't any nodes with name = 'Bob'. So if there is Bob I would like to see no results.
Here is what I've tried:
1) With exists()
MATCH p =(n)-[*1..3]->(b)
WHERE n.name = 'Alice' AND NOT EXISTS ((n {name: 'Bob'})-[*1..3]->(b))
RETURN p
But it returns all nodes and relationships.
2) With none()
MATCH p =(n)-[*1..3]->(b)
WHERE n.name = 'Alice' AND NONE (x IN nodes(p) WHERE x.name = 'Bob')
RETURN p
This returned all nodes, without Bob...
3) with any()
MATCH p =(n)-[*1..3]->(b)
WHERE n.name = 'Alice' AND NOT ANY (x IN nodes(p) WHERE x.name = 'Bob')
RETURN p
But this gave me the same result as above.
I'm running out of ideas how to return Alice only if Bob is not present.
What I would expect from query is to return Alice when I delete Bob, but when such node exists - nothing.
Any help is appreciated:)
Thanks!
You should try this query :
MATCH (n:Person {name:'Alice'})
WHERE NOT (n)-[:KNOWS*..3]-(:Person {name:'Bob'})
RETURN n
From my searchings I did not find a way to set the property of an object dynamically, only by defining it hardcoded (Like below the "Detail" property)
Here is my sample:
Neo4j Graph or via Neo4j Console
MATCH(p:Person)-[r]->(m:Movie)
WITH { Person: p.name,
Detail: collect(r.roles)
} AS Result
RETURN Result
My target (not working yet):
MATCH(p:Person)-[r]->(m:Movie)
WITH { Person: p.name,
CASTED_FOR: // --> Only values(r.roles) for relationship "CASTED_FOR" needed here
ACTED_IN: // --> Only values(r.roles) for relationship "ACTED_IN" needed here
} AS Result
RETURN Result
I know I could make e.g. [r:CASTED_FOR] or WHERE Type(r) = "CASTED_FOR", but I don't like to have multiple WITH and MATCH queries.
Thank you
This query uses Cypher's list comprehension construct to do what you want:
MATCH (p:Person)-[r]->(:Movie)
WITH p, COLLECT(r) AS rs
RETURN {
Person: p.name,
CASTED_FOR: [x IN rs WHERE TYPE(x) = 'CASTED_FOR' | x.roles],
ACTED_IN: [x IN rs WHERE TYPE(x) = 'ACTED_IN' | x.roles]
} AS Result
I am creating multiple relationships in one query. If a match is not found for the first relationship the second one is not created. If both matches exist then both relationships work.
Example:
Assume that 'MATCH1ID' below does not exist but 'MATCH2ID' does. Why does this happen?
DOES NOT WORK
MERGE (NewRecord:OBJECTNAME { Id: 'ABZDEFG' })
SET NewRecord.name='NEWNAME'
WITH NewRecord
MATCH (a)
WHERE a.Id = 'MATCH1ID'
CREATE (a)-[ar:Relationship1]->(NewRecord)
WITH NewRecord MATCH (b)
WHERE b.Id = 'MATCH2ID'
CREATE (b)-[br:Relationship2]->(NewRecord)
(If I switch the order of the node that does exist to be first in the order it works)
WORKS
MERGE (NewRecord:OBJECTNAME { Id: 'ABZDEFG' })
SET NewRecord.name='NEWNAME'
WITH NewRecord
MATCH (b)
WHERE b.Id = 'MATCH2ID'
CREATE (b)-[br:Relationship2]->(NewRecord)
WITH NewRecord
MATCH (a)
WHERE a.Id = 'MATCH1ID'
CREATE (a)-[ar:Relationship1]->(NewRecord)
You can try using a OPTIONAL MATCH instead of a simple MATCH:
MERGE (NewRecord:OBJECTNAME { Id: 'ABZDEFG' })
SET NewRecord.name='NEWNAME'
WITH NewRecord
OPTIONAL MATCH (a)
WHERE a.Id = 'MATCH1ID'
FOREACH(x IN (CASE WHEN a IS NULL THEN [] ELSE [1] END) |
CREATE (a)-[ar:Relationship1]->(NewRecord)
)
WITH NewRecord
OPTIONAL MATCH (b)
WHERE b.Id = 'MATCH2ID'
FOREACH(x IN (CASE WHEN b IS NULL THEN [] ELSE [1] END) |
CREATE (b)-[br:Relationship2]->(NewRecord)
)
Also, this query uses a trick with FORACH and CASE WHEN to handle conditions. In this case, the CREATE statement is executed only when a or b variables are not null.
See Neo4j: LOAD CSV - Handling Conditionals.
I'm trying to get Total(Sum) of a property of "df" object.I have attached screen shot of sample database I'm using
I tried to get the graph using following query
MATCH P= (n:Org)-[:O_CH*0..]->()-[:LEAF*0..]->()-[:CH*0..]->()-[:FOR*0..]->() RETURN P
To create objects
create(n:Org{name:'Root',id:1})
create(n:Org{name:'L1.1',id:2,parent:1})
create(n:Org{name:'L1.2',id:3,parent:1})
create(n:Org{name:'L1.3',id:4,parent:1})
create(n:Org{name:'L2.1',id:5,parent:3})
create(n:Org{name:'L2.2',id:6,parent:4})
create(n:Op{name:'CH1',id:7,orgId:5})
create(n:Op{name:'CH2',id:8,orgId:5 ,parent:'CH1'})
create(n:Proj{name:'P1',id:9,opp:'CH2'})
create(n:Proj{name:'P2',id:10,opp:'CH1'})
create(n:R{name:'R1',id:200,orgId:2 })
create (n:df{id:100,map:8,forecast:toFloat(10)})
create (n:df{id:101,map:7,forecast:toFloat(10)})
create (n:df{id:102,map:9,forecast:toFloat(10)})
create (n:df{id:103,map:10,forecast:toFloat(10)})
create (n:df{id:104,map:200,forecast:toFloat(10)})
To Crate relationships
MATCH (c:Org),(p:Org) WHERE c.parent = p.id create (p)-[:O_CH]->(c)
MATCH (c:Op),(p:Op) WHERE c.parent = p.name create (p)-[:CH]->(c)
MATCH (c:Op),(p:Org) WHERE c.orgId = p.id create (p)-[:LEAF]->(c)
MATCH (c:Proj),(p:Op) WHERE c.opp = p.name create (p)-[:CH]->(c)
MATCH (c:R),(p:Org) WHERE c.orgId = p.id create (p)-[:LEAF]->(c)
MATCH (c:df),(p:) WHERE c.map = p.id create (p)-[:FOR]->(c)
I'm expecting 60 as total where I get 260 as total. Please let me know where I'm wrong . Need your help to figure out.
I'm trying to get Total(Sum) of a property of "df" object.
I believe you needs a simple query that match all nodes with label :df and return the sum of node.forecast. Try it:
// Match all nodes with :df label
MATCH(n:df)
// Return the sum of the property 'forecast' of each matched node
RETURN sum(n.forecast)
From comments:
Thank you Bruno.But the thing i need to get the aggregated value as a
example if i select L2.1 , i need to get the sum of df objects which
are under that node
This should work:
MATCH({name:'L2.1'})-[*]->(n)
RETURN SUM(n.forecast)