This paper proposes two behavioral patterns called DIVIDE-&-CONQUER and BACKTRACKING to facilitate the development of algorithms based upon algorithm design techniques. The common informal seudocode that specifies the solving strategy for a general algorithm design technique is enhanced to provide a helpful guide to develop particular algorithms by following the divide and conquer and the backt...

Formulating non-trivial queries in relational languages such as SQL and QBE can prove daunting to end users. ConQuer is a conceptual query language that allows users to formulate queries naturally in terms of elementary relationships, operators such as “and”, “or”, “not” and “maybe”, contextual for-clauses and object-correlation, thus avoiding the need to deal explicitly with implementation det...