Conceptual Queries Using ConQuer-II

@inproceedings{Bloesch1997ConceptualQU,
  title={Conceptual Queries Using ConQuer-II},
  author={Anthony C. Bloesch and Terry A. Halpin},
  booktitle={ER},
  year={1997}
}
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 details such as relational tables, null values, outer joins, group-by clauses and correlated subqueries… CONTINUE READING