Selectivity Estimation for Exclusive Query Translation in Deep Web Data Integration
Source: Renmin University of China
The Deep Web continues to grow rapidly, which makes exploiting useful information a remarkable challenge. Metaquerier, which provides a uniform integrated interface to the users and can query multiple databases simultaneously, is becoming the main trend for Deep Web data integration. Query translation plays an important role in a metaquerier. However, due to the large-scale, heterogeneity and autonomy of the Web databases, automatic query translation is challenging. One of the important aspects is that Web database interfaces may express different predicate logics.