What is OData? Explain the advantages of OData?

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OData, short for Open Data Protocol, is an open protocol to allow the creation and consumption of queryable and interoperable Restful APIs, with the help of ODATA we can create and consume web services other apps.
Data model class:  ODATA services required data model definition, referred to a model provided class 
Which OData version do you use?   Ans: We used OData 1.0 version in OData &metadata we can get a version in sap OData  
What is Entity type and Entity set? What is the difference between them? 
Entity type: It is a collection of an entity having common attribute.
Attribute: the student is Entity type and name, id, address there are attribute of entity
Complex type is OData? Answer: you can use complex type without exposing entity type, complex type is such entity they attribute without containing a unique key

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