1990-09-24
Duplicates and translation of nested SQL queries into XRA
Publication
Publication
Presented at the
PDS Workshop (September 1990), Noordwijk, The Netherlands
The PRISMA/DB system contains a parser to translate the database language SQL into eXtended Relational Algebra (XRA). The early definition of XRA, which has a multi-set semantics, proves inadequate for translating SQL according to its nested-iteration semantics. The prime cause is that no distinction is made between original and generated duplicate tuples during nested query handling. To achieve a correct translation, tuple identifiers were introduced into XRA and the system.
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| doi.org/10.1007/3-540-54132-2_66 | |
| PDS Workshop | |
| Organisation | Centrum Wiskunde & Informatica, Amsterdam (CWI), The Netherlands |
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Verbrugge, N. T. (1990). Duplicates and translation of nested SQL queries into XRA. In Lecture Notes in Computer Science/Lecture Notes in Artificial Intelligence (pp. 354–364). doi:10.1007/3-540-54132-2_66 |
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