neo4j

问题 I have a node and I want to add one property property_x whose value I want to be {"year1":value, "year2":value} . Making more than one node for each year is not needed as I need these values in my processing together. 回答1: Neo4j only supports certain kinds of properties (docs): ...there are restrictions as to what types of values can be used as property values. Allowed value types are as follows: Numbers: Both integer values, with capacity as Java’s Long type, and floating points, with

问题 I have a node and I want to add one property property_x whose value I want to be {"year1":value, "year2":value} . Making more than one node for each year is not needed as I need these values in my processing together. 回答1: Neo4j only supports certain kinds of properties (docs): ...there are restrictions as to what types of values can be used as property values. Allowed value types are as follows: Numbers: Both integer values, with capacity as Java’s Long type, and floating points, with

问题 I am trying to write a query to pull data from my Neo4J database. Lets say there are five conditions that determine whether or not I want to pull _____ from my database: A, B, C, D, and E. The boolean expression which determines this is: A && B && (C || D || E) From scouring the web, I cannot find any information about an order of operations that Neo4J AND and OR queries abide by (AND usually precedes OR), but from my observations they seem like they execute sequentially. Since there is no

问题 I have the following graph: Currently I am using this QUERY to add a relationship between two nodes: MATCH (a:Service),(b:Service) WHERE a.service_id = 'cs2322' and b.service_id = 'ab3232' CREATE (a)-[r:DEPENDENT_ON]->(b) RETURN type(r) However I dont want to have more than one relationship between any two nodes, because I want to visualise my services and the dependency between them, so I cannot have a service being two times dependent on the other. Is there any way I can limit this to force

问题 I have a graph of tags, which are related with each other. My goal is to create a Cypher query, which will return all tags that are related to an array of input tags via 1 or 2 hops. I made a query, which doesn't work quite as intended. MATCH (t:Tag) WHERE t.name IN ["A", "B", "C"] WITH t MATCH (a:Tag)-[:RELATED*1..2]-(t) RETURN DISTINCT a; This query first finds the nodes A , B , C and then searches for tags, that are related to A , B or C via 1 node or less. What I want to do though is to

问题 I have a graph of tags, which are related with each other. My goal is to create a Cypher query, which will return all tags that are related to an array of input tags via 1 or 2 hops. I made a query, which doesn't work quite as intended. MATCH (t:Tag) WHERE t.name IN ["A", "B", "C"] WITH t MATCH (a:Tag)-[:RELATED*1..2]-(t) RETURN DISTINCT a; This query first finds the nodes A , B , C and then searches for tags, that are related to A , B or C via 1 node or less. What I want to do though is to

问题 I have a graph of tags, which are related with each other. My goal is to create a Cypher query, which will return all tags that are related to an array of input tags via 1 or 2 hops. I made a query, which doesn't work quite as intended. MATCH (t:Tag) WHERE t.name IN ["A", "B", "C"] WITH t MATCH (a:Tag)-[:RELATED*1..2]-(t) RETURN DISTINCT a; This query first finds the nodes A , B , C and then searches for tags, that are related to A , B or C via 1 node or less. What I want to do though is to

问题 I have a graph of tags, which are related with each other. My goal is to create a Cypher query, which will return all tags that are related to an array of input tags via 1 or 2 hops. I made a query, which doesn't work quite as intended. MATCH (t:Tag) WHERE t.name IN ["A", "B", "C"] WITH t MATCH (a:Tag)-[:RELATED*1..2]-(t) RETURN DISTINCT a; This query first finds the nodes A , B , C and then searches for tags, that are related to A , B or C via 1 node or less. What I want to do though is to

问题 I'd like a query that counts how many nodes have each label in the dataset. For instance: LabelA 100 LabelB 200 I can do this for each individual label with something like MATCH (n:LabelA) return count(n); But, I'd like to do it for every label in one command. 回答1: Try something like this MATCH (n) RETURN DISTINCT count(labels(n)), labels(n); This will return the sum of the labels in the first column and the label name in the second. 回答2: A quick alternative here, for single labels only, APOC

问题 I'd like a query that counts how many nodes have each label in the dataset. For instance: LabelA 100 LabelB 200 I can do this for each individual label with something like MATCH (n:LabelA) return count(n); But, I'd like to do it for every label in one command. 回答1: Try something like this MATCH (n) RETURN DISTINCT count(labels(n)), labels(n); This will return the sum of the labels in the first column and the label name in the second. 回答2: A quick alternative here, for single labels only, APOC