Binary relational operations are operations in relational algebra that take two relations as input and produce a new relation.
Two important binary relational operations are:
- JOIN
- DIVISION
1.) Join
Join operation is defined as merging or combining the related tuples from the two different relations into a single type.
- It allows you to retrieve meaningful data by combining rows that satisfy certain conditions across two or more tables.
- It can be said that it is similar to cartesian product expect the fact that in cartesian product, we get all the possible combinations of relations while in join, only those combinations can be formed that meets some matching conditions.
2.) Division
The DIVISION operation in relational algebra is used when you want to find a set of tuples in one relation that match all tuples in another relation.
- It is useful in queries that involve “all” conditions, such as “find the entities that relate to all items in a set.”
