Abstract: A neural network database is disclosed. A learning task to teach a single model to answer any query is formulated. The example neural network database learns existing patterns between query input and output and by exploits the query and data distributions through a decision tree having multiple neural network leaf nodes representing partitions of the queries from the database. The neural network architecture is used to answer different query types efficiently. A generic neural network database framework can learn to answer different query types such as distance to nearest neighbor queries and range aggregate queries. The example neural database answers these two query types with orders of magnitude improvement in query time over the state-of-the-art competitions, and by constructing a model that takes only a fraction of data size.