Write short notes on relational model, Database Management System

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Write short notes on relational model

The relational model uses a collection of tables to show both data and the relationships between those data. The relational model is an example of a record based model.

 


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Describe Object Relational model ? Object Relational Model - This model combines the characteristics of both relational model and object oriented model. It extends the tradit

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Write short notes on relational model   The  relational  model  uses a  collection of  tables  to show  both data  and the relationships between those  data.  The relational mo

Relationship, What is multiple relationship ?

What is multiple relationship ?

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Multilevel Indexing Scheme Consider the indexing scheme where the address of the block is consider in the index for each record, for a little file, this index would be little a

Primary key, The primary key is selected from the

The primary key is selected from the

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A Functional dependency is described by X Y between two groups of attributes Y and X that are subsets of R specifies a constraint on the possible tuple that can make a relation

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What are partial, alternate,, artificial, compound and natural key? Partial Key: It is a set of attributes that can uniquely recognize weak entities and that are related to s

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