Technical Report Number
The problem of selecting database tuples is central to the task of resolving many forms of queries. The report defines a class of selection queries and presents a set of algorithms for their efficient resolution. The class of queries investigated is those queries which impose a quasi order on the tuples in a database.
Griswold, Victor Jon, "Efficient Queries For Quasi-Ordered Databases" Report Number: WUCS-91-06 (1991). All Computer Science and Engineering Research.