Towards a more familiar relational retrieval language

摘要

The aim of this paper is to present the results of an investigation in so-called relational retrieval languages. These languages are often used by non-programmers employing as information model or external schema the normalized relational model. The relational retrieval languages known to the author contain two aspects which are specially inconvenient for a non-mathematician, namely in the majority of non-trivial questions one needs a long and complicated query formulation and the forced use of variables. In this paper a relational retrieval language will be discussed, which offers a solution to avoid these inconveniences.