For part 1 here

In previous Post I write about what is graph database in depth.I would recommend to study it.

How we create Graph in Apache AGE. AGE is extension in postgreSQL for graph database functionality.

Create a Graph

To create a graph, use the create_graph function, located in the ag_catalog namespace.

Syntax: create_graph(graph_name);

Returns:

void

Considerations

This function will not return any results. The graph is created if there is no error message.

Tables needed to set up the graph are automatically created.

Example:

SELECT * FROM ag_catalog.create_graph('graph_name');

To Create vertex and edge labels:

CREATE LABEL person;
CREATE LABEL knows (weight double);

How we insert data into Graph:

INSERT INTO person VALUES (1, 'Alice'), (2, 'Bob'), (3, 'Charlie');
INSERT INTO knows VALUES (1, 2, 0.8), (1, 3, 0.5), (2, 3, 0.6);

Final Step How we Query on Graph

MATCH (a:person)-[e:knows]->(b:person) WHERE e.weight > 0.6 RETURN a,b;

Delete a Graph

To delete a graph, use the drop_graph function, located in the ag_catalog namespace.

Syntax: drop_graph(graph_name, cascade);

References:

1. https://age.apache.org/age-manual/master/intro/graphs.html
2. https://www.fabiomarini.net/postgresql-with-apache-age-playing-more-seriously-with-graph-databases/
3. https://bitnine.net/blog-about-bitnine/blog-press/age-postgresql-extension-graph-database-functionality/?ckattempt=1