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What is Asterisk in SQL?
Asterisk (*): In SQL, the columns for all the tables and views in the FROM clause will be displayed.
An object-oriented design process 1. Define the context and modes 2. Designs the system architecture 3. Identifies the principal system objects 4. Identifies concurrency in
Explain the Natural join Natural join is a binary operator which is written as (R* S) in which R and S are relations. The effect of the natural join is the set of all combinati
explain the level architectures of the database management system
What is a relationship called when it is maintained between two entities? A relationship is called Binary relationship when it is maintained between two entities.
courier company er-diagram
What is meant by object identifiers? Object-oriented systems use an object identifier to recognize objects. Object identifiers are unique: that is every object has a single ide
how many types of data model in DBMS? explain data abstraction with its different level
What is relational model feature? A relational model feature is much more data independence than some other database models.
aggregation
What is an entity relationship model? The entity relationship model is a collection of basic objects known as entities and relationship between those objects. An
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