- Trending Categories
- Data Structure
- Operating System
- C Programming
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Explain division operation in relational algebra (DBMS)?
Query is a question or requesting information. Query language is a language which is used to retrieve information from a database.
Query language is divided into two types −
Information is retrieved from the database by specifying the sequence of operations to be performed.
For Example: Relational algebra.
Structure Query language (SQL) is based on relational algebra.
Relational algebra consists of a set of operations that take one or two relations as an input and produces a new relation as output.
Types of Relational Algebra operations
The different types of relational algebra operations are as follows −
Cartesian product operation
Union, intersection, difference, cartesian, join, division comes under binary operation (operate on two table).
The division operator is used for queries which involve the ‘all’.
R1 ÷ R2 = tuples of R1 associated with all tuples of R2.
Retrieve the name of the subject that is taught in all courses.
The resulting operation must have all combinations of tuples of relation S that are present in the first relation or R.
Retrieve names of employees who work on all the projects that John Smith works on.
Consider the Employee table given below −
Works on the following −
The result is as follows
The expression is as follows
Smith <- ΠPno(σEname = ‘john smith’ (employee * works on Pno=Eno))
- Explain project operation in relational algebra (DBMS)?
- Explain rename operation in relational algebra (DBMS)?
- Explain union operation in relational algebra (DBMS)?
- Explain intersection operation in relational algebra (DBMS)?
- Explain the select operation in relational algebra (DBMS)?
- What is join operation in relational algebra (DBMS)?
- Explain the relational algebra in DBMS?
- Explain cartesian product in relational algebra (DBMS)?
- Explain the binary operations in relational algebra (DBMS)?
- Explain the evaluation of relational algebra expression(DBMS)
- Write queries using aggregate functions in relational algebra (DBMS)?
- Explain the Relational Model in DBMS?
- Difference between Relational Algebra and Relational Calculus
- Basic Operators in Relational Algebra
- Explain the unary operations of algebra relations in DBMS?