Making Structured Data Searchable via Natural Language Generation with an Application to ESG Data

摘要

Relational Databases are used to store structured data, which is typically accessed using report builders based on SQL queries. To search, forms need to be understood and filled out, which demands a high cognitive load. Due to the success of Web search engines, users have become acquainted with the easier mechanism of natural language search for accessing unstructured data. However, such keyword-based search methods are not easily applicable to structured data, especially where structured records contain non-textual content such as numbers. We present a method to make structured data, including numeric data, searchable with a Web search engine-like keyword search access mechanism. Our method is based on the creation of surrogate text documents using Natural Language Generation (NLG) methods that can then be retrieved by off-the-shelf search methods. We demonstrate that this method is effective by applying it to two real-life sized databases, a proprietary database comprising corporate Environmental, Social and Governance (ESG) data and a public-domain environmental pollution database, respectively, in a federated scenario. Our evaluation includes speed and index size investigations, and indicates effectiveness (P@1 = 84%, P@5 = 92%) and practicality of the method.