Date Added: Jan 2011
Keyword search is one of the most effective paradigms for information discovery. One of the key advantages of keyword search querying is its simplicity. There is an increasing need for allowing ordinary users to issue keyword queries without any knowledge of the database schema. The retrieval unit of keyword search queries over relational databases is different than in IR systems. While the retrieval unit in those IR systems is a document, in the case, the result is a synthesized document formed by joining a number of tuples.