Liu Jifen(Department of Mathematics,Nanchang University,Nanchang 330047) Maoting Gao(Department of Mathematics,Jiangxi Normal University,Nanchang 330027)
Abstract：We introduce the method of accomplishing various kinds of non-deterministric data query and the principle of constructing query condition by seperating selection operation from a specific question in a relational database system.
1997, Vol. 21 