Author Retains CopyrightChan, Clifton Hei Chit2011-03-282022-10-252011-03-282022-10-2519851985https://ir.wgtn.ac.nz/handle/123456789/23456The increasing number and use of database management systems calls for a adequate approach to the incomplete information problem. In this thesis we describe the problem and examine a number of solutions. A new query language, QUIS is defined. QUIS is a user friendly language based on Lipski's theories on incomplete information, the normal distribution and confidence intervals. A subset of the language was implemented to demonstrate its practicality.pdfen-NZhttps://www.wgtn.ac.nz/library/about-us/policies-and-strategies/copyright-for-the-researcharchiveProgramming languagesQUISComputer scienceTextAll rights, except those explicitly waived, are held by the Author