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Explain ER Relationship model?
An entity-relationship model (ERM): An entity-relationship model (ERM) is an abstract theoretical illustration of structured data. Entity-relationship modelling is a relational schema database modelling techniques, used in software engineering to produce a kind of conceptual data model (or semantic data model) of a system, frequent a relational database, and its needs in a top-down fashion. Diagrams created using this procedure are known as entity-relationship diagrams, or ER diagrams or ERDs for short.
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Give an example of operations from the State Actions and Activities. For instance, in bank the activity verify account code and verify password
In a Hierarchical model of data records are organized ? In the hierarchical model of data records are organized as Tree structure.
Explain Relational model and their use in DBMS? Relational Model - The relational model was first introduced through E.F. Codd of the IBM Research in the year of 1970. The mode
why are older data models are being replaced by new data models
The Form input elements are: Reporter name text type input Password
how does Btree differ from a B+ - tree?
explain participation constraints with examples
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Q. Explain the terms key constraints participation constraints and mapping caradinalities in ER model. Participation Constraints : The participation of an entity set E i
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