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Incorporating Hypothetical Views and Extended Recursion into SQL Database Systems *

Gabriel Aranda-López, Susana Nieva, Fernando Sáenz-Pérez, Jaime Sánchez-Hernández
Now we introduce a formalization and an implementation of the database system HR-SQL that, in addition to extended recursion, incorporates hypothetical reasoning in a novel way which cannot be found in  ...  Current database systems supporting recursive SQL impose restrictions on queries such as linearity, and do not implement mutual recursion.  ...  In addition our system allows both less-limited recursion (w.r.t. current SQL systems) and hypothetical reasoning (as a novel addition to such systems), acting as a front-end to DB2.  ...