Logics with aggregate operators.
We study adding aggregate operators, such as summing up elements of a column of a relation, to logics with counting mechanisms. The primary motivation comes from database applications, where aggregate operators are present in all real life query languages. Unlike other features of query languages, a...
| Udgivet i: | Journal of the ACM 48, 4 (2001). |
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| Format: | Article |
| Sprog: | English |
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