What is the name of the document on project "Graph Database project"?
SELECT document_name  FROM Documents AS T1 JOIN projects AS T2 ON T1.project_id   =   T2.project_id WHERE T2.project_details   =   'Graph Database project'
name of the document refers to document_name; project 'Graph Database project' refers to project_details = 'Graph Database project'; linking documents to projects via project_id;