This paper introduces the basic concepts of logical query languages for databases and the methods on evluation of queries. The current situation and the fields of research in logical query languages are presented briefly.
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美
- 介紹數據庫邏輯詢(xún)問(wèn)語(yǔ)言的基本概念和詢(xún)問(wèn)求值的方法，并扼要介紹邏輯詢(xún)問(wèn)語(yǔ)言的研究現狀和研究方向。
