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foreword
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I feel that Neo4j is very powerful when I use Neo4j to make a knowledge map. Here I record my learning process. Welcome all bloggers to communicate
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1. Nodes that match multiple labels at the same time
match (a:CHEM:TECT:WORD) return a
match (a:User:Admin)-->(b) return a,b
2. Edges that match multiple labels at the same time
match (a)-[r:TYPE1|TYPE2]->(b) return r
3. Allow nodes and edges that match multiple labels
match (a)-[r]-(b) where (a:"标签1" or a:"标签2") and (b:"标签1" or b:"标签2") and (r:"标签a" or r:"标签b") return a,b,r
4. Obtain a list sorted by node name
distinct means deduplication
match (n) with n order by n.name return collect(distinct n)
5. Merge the start and end points of the relationship into an ordered list
unwind means to unwind the list
match (a)-[p]-(b) with collect(a) as a,collect(b) as b with a+b as c unwind c as node with node order by node.name return collect(distinct node)