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DKE/Neo4j

 (15)
[Neo4j] LIMIT / 2023.02.16 https://neo4j.com/docs/cypher-manual/current/clauses/limit/ LIMIT - Cypher Manual `LIMIT` constrains the number of returned rows. neo4j.com *Example Graph create (a {name:'A'}), (b {name:'B'}), (c {name:'C'}), (d {name:'D'}), (e {name:'E'}), (a)-[:KNOWS]->(b), (a)-[:KNOWS]->(c), (a)-[:KNOWS]->(d), (a)-[:KNOWS]->(e) LIMIT는 반환되는 행의 수를 제한함 LIMIT는 양의 정수로 평가되는 모든 식을 허용하지만 노드나 관계를 참조할 수는 없음 1. Return ..
[Neo4j] SKIP / 2023.02.15 https://neo4j.com/docs/cypher-manual/current/clauses/skip/ SKIP - Cypher Manual `SKIP` defines from which row to start including the rows in the output. neo4j.com *Example Graph create (a {name:'A'}), (b {name:'B'}), (c {name:'C'}), (d {name:'D'}), (e {name:'E'}), (a)-[:KNOWS]->(b), (a)-[:KNOWS]->(c), (a)-[:KNOWS]->(d), (a)-[:KNOWS]->(e) 1. Skip first three rows #처음 세 노드는 건너뛰고 마지막 두 노드만 결과로 반환 M..
[Neo4j] ORDER BY / 2023.02.14 https://neo4j.com/docs/cypher-manual/current/clauses/order-by/ ORDER BY - Cypher Manual `ORDER BY` is a sub-clause following `RETURN` or `WITH`, and it specifies that the output should be sorted and how. neo4j.com *Example Graph create (a {name:'A', age:34, length:170}), (b {name:'B', age:36}), (c {name:'C', age:32, length:185}), (a)-[:KNOWS]->(b), (b)-[:KNOWS]->(c) ORDER BY는 출력을 정렬할 수 있음 1. Ord..
[Neo4j] UNWIND / 2023.02.13 https://neo4j.com/docs/cypher-manual/current/clauses/unwind/ UNWIND - Cypher Manual `UNWIND` expands a list into a sequence of rows. neo4j.com UNWIND :풀다, 펴다 UNWIND를 사용하면 list를 개별 행으로 변환할 수 있음 UNWIND 절에서는 내부 변수의 새 이름을 지정해야 함 1. Unwinding a list 리터럴 목록을 x 행으로 변환하여 반환 #null을 포함한 원래 list의 값은 각각 개별 행으로 반환 UNWIND [1, 2, 3, null] AS x RETURN x, 'val' AS y 2. Creating a distinct list DISTINCT를 사용하여 중복된..
[Neo4j] WITH / 2023.02.13 https://neo4j.com/docs/cypher-manual/current/clauses/with/ WITH - Cypher Manual The `WITH` clause allows query parts to be chained together, piping the results from one to be used as starting points or criteria in the next. neo4j.com *Example Graph create (anders {name:'Anders'}), (caesar {name: 'Caesar'}), (bossman {name: 'Bossman'}), (george {name:'George'}), (david {name: 'David'}), (anders)-..
[Neo4j] RETURN / 2023.02.08 https://neo4j.com/docs/cypher-manual/current/clauses/return/ RETURN - Cypher Manual The `RETURN` clause defines what to include in the query result set. neo4j.com *Example Graph CREATE (a {name:'A', age:55, happy:"Yes!"}), (b {name:'B'}), (a)-[:BLOCKS]->(b), (a)-[:KOWS]->(b) 1. Return nodes 반환하고 싶은 노드를 RETURN 구문에 나열 #name이 B인 노드 반환 MATCH (n {name: 'B'}) RETURN n 2. Return relationships 관계를 반환하려면..
[Neo4j] MATCH (Get node or relationship by elementId) / 2023.02.08 https://neo4j.com/docs/cypher-manual/current/clauses/match/#query-shortest-path MATCH - Cypher Manual The `MATCH` clause is used to search for the pattern described in it. neo4j.com *Example Graph 1. Node by elementId elementId() 함수를 사용해서 ID로 노드를 검색할 수 있음 #id가 0번인 Charlie Sheen 노드 반환 MATCH (n) WHERE split(elementId(n), ":")[2] = "0" RETURN n 2. Relationship by elementId elementId() 함수를 사용해서 관계를 ..
[Neo4j] MATCH (Shortest path) / 2023.02.07 https://neo4j.com/docs/cypher-manual/current/clauses/match/#query-shortest-path MATCH - Cypher Manual The `MATCH` clause is used to search for the pattern described in it. neo4j.com *Example Graph 1. Single shortest path shortestPath() 함수를 사용하여 최단 경로 찾기 #Martin Sheen 과 Oliver Stone사이의 15홉이내 중 최단 경로 찾기 MATCH (martin:Person {name: 'Martin Sheen'}), (oliver:Person {name: 'Oliver Stone'}), p = short..

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