A More General Model For Handling Missing Information In Relational DataBases Using A 3-Valued Logic
| dc.contributor.author | Yue, Kwok-Bun | |
| dc.date.accessioned | 2019-10-04T19:46:24Z | |
| dc.date.available | 2019-10-04T19:46:24Z | |
| dc.date.issued | 1991-09 | |
| dc.description.abstract | Codd proposed the use of two interpretations of nulls to handle missing information in relational databases that may lead to a 4-valued logic [Codd86, Codd87]. In a more general model, three interpretations of nulls are necessary [Roth, Zani]. Without simplification, this may lead to a 7-valued logic, which is too complicated to be adopted in relational databases. For such a model, there is no satisfactory simplification to a 4-valued logic. However, by making a straightforward simplification and using some proposed logical functions, a 3-valued logic can handle all three interpretations. | en_US |
| dc.identifier.citation | Yue, K., A More General Model For Handling Missing Information In Relational DataBases Using A 3-Valued Logic. SIGMOD Record. vol.20, no.3, pp 43-49, September 1991. | en_US |
| dc.identifier.uri | https://hdl.handle.net/10657.1/1501 | |
| dc.publisher | SIGMOD Record | en_US |
| dc.title | A More General Model For Handling Missing Information In Relational DataBases Using A 3-Valued Logic | en_US |
| dc.type | Article | en_US |
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