FAQ’s on Relational Query Language
Q.1: What is the difference between Relational Calculus and Relational Algebra ?
Answer:
Relational Algebra is a Procedural Query Language whereas Relational Calculus is a Non Procedural Query Language.
Relational Algebra targets on how to get the result whereas Relational Calculus focuses on what result is to be obtained.
Q.2: What is Relational Algebra?
Answer:
Relational Algebra is a Procedural Query Language that targets on how to get the results , It take instances of relations as input and then yields instances of relations as output ,it is performed recursively on a relation.
Q.3: What is the use of Relational Query Language?
Answer:
Relational Query Language is used by users to communicate with the database , It uses relational Algebra to break the user requests and instructs the DBMS to execute those requests . Relational Query Language can be Procedural or Non Procedural.
Q.4: What are the types of Relational Calculus?
Answer:
There are two types of Relational Calculus Tuple Relational Calculus and Domain Relational Calculus.
Relational Query Language in DBMS
SQL has its own querying methods to interact with the database. But how do these queries work in the database? These queries work similarly to Relational Algebra that we study in mathematics. In the database, we have tables participating in relational Algebra.
Relational Database systems are expected to be equipped with a query language that assists users to query the database. Relational Query Language is used by the user to communicate with the database user requests for the information from the database. Relational algebra breaks the user requests and instructs the DBMS to execute the requests. It is the language by which the user communicates with the database. They are generally on a higher level than any other programming language. These relational query languages can be Procedural and Non-Procedural.
Types of Relational Query Language
There are two types of relational query language:
- Procedural Query Language
- Non-Procedural Language