A functional dependency is a constraint between two sets of attributes in a relation. It is the property of semantics or meaning of attribute. Functional dependency is also a property of relational schema "R" an
When the correct dimension record is unavailable for a given fact event, young data marts will sometimes set the fact table’s corresponding foreign key attribute to a special value meaning “missing reference data.” Because this is disappointing to users and undermines the credibility of the BI...
MultiplicityAbbreviationMeaningNote 0.. 1 0 or 1 (at most one) 0..* * 0 to many (zero or more) 1 exactly 1 Assumed by default 1..* 1 or more (at least 1) n..* n or more (at least n) n≥ 0 n..m at least n and at most m m > n ≥ 0 In the ORM model,...
Any definitions expressly set forth herein for terms contained in such claims shall govern the meaning of such terms as used in the claims. Hence, no limitation, element, property, feature, advantage or attribute that is not expressly recited in a claim should limit the scope of such claim ...
most databases choose to be “AP”, meaning they provide Availability and Partition-Tolerance. Since Partition-Tolerance is a property that often cannot be traded off, Availability and Consistency are juggled, with most databases sacrificing more consistency than availability [43]. In Fig.1, an il...
and represents a substantial meaning of a document as it is. Thus, the application of the XML has gradually been active since it was adopted as a recommendation in W3C in February, 1998. The XML document management system is gradually developing from a system based on a file system to a ...