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Graph - Coggle Diagram
Graph
Trees
properties
every node is the root of a subtree
every two nodes are connected on one
has no cycles
has one less edge than it has nodes
Hierarchy
extra properties
subordination
inheritance
have roles
Materialized Path
columns to represent the edges
single table
Adjacency list model
identifier
column of the same data type
two tables
nested sets
diagram of “dots”
nodes
edges
undirected
directed