12 STD || PART-4 || CH: 11 DATABASE CONCEPTS || COMPUTER SCIEN

 

Relational Algebra in DBMS

What is Relational Algebra?

Relational Algebra, was first created by Edgar F Codd while at IBM. It was used for modeling the data stored in relational databases and defining queries on it.

Relational Algebra is a procedural query language used to query the database tables using SQL. Relational algebra operations are performed recursively on a relation (table) to yield an output. The output of these operations is a new relation, which might be formed by one or more input relations. Relational Algebra is divided into various
groups 

 

 

Unary Relational Operations

SELECT ( symbol : ó)

PROJECT ( symbol : Ð)

 

 

 

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 12 STD ||  PART-4  ||  CH: 11  DATABASE CONCEPTS  || COMPUTER SCIENCE

 

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