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Compilation plans are built based on physical manifestation of logical operators and optimal join orders from a tree of joins based on cardinality estimations derived from statistics stored for the relations and their attributes involved in the query. In this paper we are defining a new metric ...
It should be noted that the relational model arranges data into at least one table of rows and columns using a unique key. The columns are referred to as attributes while the rows are called tuples or records. Furthermore, each of the rows as contained in a table has its unique key. A...
ndthosefaketuplesinT1candT2cthatmustjoinwithatleastonerealtupleandhenceappearintheresultofcase2orcase3 LetAbethesetofjoinattributes Letr Aopt Adenotethejoinpredicates LetC2andC3denotethejoinresultsincase2and3respectively We rstobtainthesetoffaketuplesRandusethecorrespondingauditingrulesbelowtocheckwhether...