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# How to get result set suitable for graph visualisation
There are some requirements for result sets if you want to build a graph.
There are some [requirements][1] for result sets if you want to build a graph.
Here is an example of building a query that returns a result set appropriate for graph visualisation.
Let's say, you have 2 tables:
@@ -25,7 +25,8 @@ student:
Each student belongs to a certain house.
Let's say you want to build a graph with houses and students as nodes, where each house is linked with its students.
We are going to use [json_object][1] function to form JSONs. The result set should contain both nodes and edges and we have to provide a field indicating that (0 - for nodes and 1 - for edges). Let's provide it as 'object_type':
We are going to use [json_object][2] function to form JSONs. The result set should contain both nodes and edges
and we have to provide a field indicating that (0 - for nodes and 1 - for edges). Let's provide it as 'object_type':
```sql
SELECT json_object('object_type', 0)
@@ -99,3 +100,6 @@ Run the query, the result set will look like this:
| {"object_type":1,"node_source":"Slytherin","target":3} |
| {"object_type":1,"node_source":"Ravenclaw","target":4} |
| {"object_type":1,"node_source":"Hufflepuff","target":5} |
[1]: ./graph
[2]: https://sqlite.org/json1.html#jobj