User Charge Estimation in Numeric Online Databases: A Methodology |
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Page 21
... TAHITI 1984 0,02 556556 BURMA 1983 0,75 556556 TAHITI 1984 0,42 Fig . 2. Sample database Assume that some user of an NDB based on the RDM wishes to know the market - shares of different after - shave lotions in Tahiti in 1984. Assume ...
... TAHITI 1984 0,02 556556 BURMA 1983 0,75 556556 TAHITI 1984 0,42 Fig . 2. Sample database Assume that some user of an NDB based on the RDM wishes to know the market - shares of different after - shave lotions in Tahiti in 1984. Assume ...
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... TAHITI in 1984. ( Assumption : the product TYPE of after - shave lotions is 19500 ) . This query requires that , first , the PRODUCTS and MARKETS files are searched in order to find the records that contain the TYPE value 19500 ( in the ...
... TAHITI in 1984. ( Assumption : the product TYPE of after - shave lotions is 19500 ) . This query requires that , first , the PRODUCTS and MARKETS files are searched in order to find the records that contain the TYPE value 19500 ( in the ...
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... TAHITI ) ^ ( YEAR ,, 1984 ) ) = { ( COUNTRY , = , TAHITI ) , ( YEAR , = , 1984 ) ) . Given an elementary predicate p and AD1 , the function v - pred ( p , AD1 ) checks , whether or not p is valid with respect to AD1 . For example , v ...
... TAHITI ) ^ ( YEAR ,, 1984 ) ) = { ( COUNTRY , = , TAHITI ) , ( YEAR , = , 1984 ) ) . Given an elementary predicate p and AD1 , the function v - pred ( p , AD1 ) checks , whether or not p is valid with respect to AD1 . For example , v ...
Contents
USER CHARGING | 13 |
THE RELATIONAL DATA MODEL | 20 |
CARDINALITY ESTIMATION IN NUMERIC ONLINE | 32 |
Copyright | |
7 other sections not shown
Common terms and phrases
A-names access strategy Appendix approach attribute description set attribute name set attribute selectivity attribute values attributes PRODUCT-NO basis BDBs candidate keys cardinality estimation charging methods CODATA components computed connect-time considered constructed data model database files Database Management Database Management Systems database user developed elementary predicates English Summary example expression F1 and F2 FD-set file design file organization file structures Finland functional dependencies implementation information retrieval Information Science intermediate files inverted file Järvelin join attribute join predicate julkaisuja manipulation MANUF-NO MARKET-SHARE methodology n-tuple NDBs Numeric Databases online databases operand file description procedure cost model processing cost PRODUCTS file QSALES query cardinality query cost modelling query negotiation query optimization query processing query results r-card r-description RA operations records relational algebra relational data model restriction predicate result file description SIGMOD sort-key storage parameters Systems TAHITI TRADEMARK TYPE unit charges University of Tampere upper bound user charge estimation vendor