期刊名称：International Journal of Advanced Research In Computer Science and Software Engineering
印刷版ISSN：2277-6451
电子版ISSN：2277-128X
出版年度：2012
卷号：2
期号：4
出版社：S.S. Mishra
摘要：Information retrieving and storing are the basic tasks of the relational database. Query optimization is used for accessing database in an efficient manner, analysing and choosing an optimized plan is a complex process. Today's end-users are more interested in specific results rather than getting response in short time. Ranking queries (or top-k queries) are support for accessing specific results based on user's demand. Efficient execution of top -k queries is becoming a major challenge for relational database. Ranking queries produce results that are ordered on some ranking attribute. In this paper some light has been thrown on query optimization and its challenges, and rank query has been discussed
关键词：Query Optimization; Top-k Query; Rank Function; Information Retrieval
