Querying uncertain data in heterogeneous databases

PSM Tsai, ALP Chen - … Workshop on Research Issues in Data …, 1993 - ieeexplore.ieee.org
PSM Tsai, ALP Chen
Proceedings RIDE-IMS93: Third International Workshop on Research …, 1993ieeexplore.ieee.org
In heterogeneous databases, the user may issue a query to joint two relations in different
databases on the keys. However, the keys may be incompatible. The authors extend results
on probabilistic query processing to consider joining two relations with incompatible keys. A
new approach to identify the'same'entities in different relations is proposed. Various data
and schema conflicts such as missing data, inconsistent data and domain mismatch are
considered in the identification process. Probabilistic techniques are used to estimate the …
In heterogeneous databases, the user may issue a query to joint two relations in different databases on the keys. However, the keys may be incompatible. The authors extend results on probabilistic query processing to consider joining two relations with incompatible keys. A new approach to identify the 'same' entities in different relations is proposed. Various data and schema conflicts such as missing data, inconsistent data and domain mismatch are considered in the identification process. Probabilistic techniques are used to estimate the sameness of two entities, to process queries, and to estimate the degree of uncertainty for the query results.< >
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