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| Algebra | 1 |
| Databases | 1 |
| Estimation (Mathematics) | 1 |
| Fees | 1 |
| Mathematical Models | 1 |
| Online Systems | 1 |
| Operations Research | 1 |
| Search Strategies | 1 |
| User Needs (Information) | 1 |
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| Information Processing and… | 1 |
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| Jarvelin, Kalervo | 1 |
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Peer reviewedJarvelin, Kalervo – Information Processing and Management, 1986
Develops an approach for advance estimation of user charges based on information actually retrieved by searching numeric databases, and defines a method for query cardinality estimation. Based on the relational data model, which uses relational algebra, this method uses formal file descriptions to describe the database files. (LRW)
Descriptors: Algebra, Databases, Estimation (Mathematics), Fees
