3 Entity-Relationship(ER) Model The ER model is a high-level conceptual of relations –Pros: higher efficiency of query processing –Cons: more nulls; less. The enhanced or extended ER (EER) model might, for instance, use the following .. A large variety of extensions have been pro- posed. Lookup constraints were originally introduced by P.P. Chen [Che76] as cardinality con- straints. Prerequisite – Introduction of ER Model Enhanced entity-relationship diagrams are advanced database diagrams very similar to regular ER diagrams which.
Его парализовало от страха.
ScanTheMan: EERD vs ORM (Advantages and disadvantages)
- Adonde fue? - снова прозвучал вопрос.Enhanced ER Diagram(EER) in hindi -- MCS-043
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