12. Graph Databases#
12.1. Many-to-many databases in the real world#
Social network datasets
A follows B, A is a friend of B
Internet dataset
Page A links to Page B
Road network datasets
Road A is connected to road B
Scientific literature datasets
Paper is written by author, cites another paper
Scientific interaction datasets
Disease treated by drug, drug A and drug B have interactions
These (and more) motivate models of networked data, i.e., models of graph data.
Graphs consists of nodes, edges, and properties (of nodes or edges).