Abstract: The subject matter discloses a system for handling complex database queries using parallel HTTP requests. The system includes a processor configured to receive a query from a software application to access relational data from a data source. The system processes the received query to generate a plurality of queries that are delivered concurrently as HTTP requests to API Backends to retrieve data. For each request to each of the API Backends, Cypher request is sent to the data source. A plurality of GraphQL responses are received from the backends. The system further generates a table from the responses based on a relational database schema such as user-defined table functions (UDTFs) and transmits the generated table to the nodes as a response to the database query.