<p>The UADB project, in collaboration with <a href="https://www.cs.uic.edu/~bglavic/dbgroup/members/bglavic.html">UIC</a> and <a href="https://cs.nju.edu.cn/sufeng/index_en.htm">Nanjing Tech</a>, is a lightweight model of incomplete data based on ranges. Instead of attempting to produce exact results, UADBs instead answer queries with bounds (both lower and upper) on the space of possible results. In addition to providing more valuable feedback for users, these bounds can be relaxed to improve performance.</p>