About the set operator in the DB

This article examines the set operator of the DB.

Hello!

In databases, set operators are used to combine or divide data extracted from multiple tables.

These set operators manipulate and combine two or more sets to produce new results.

Now let’s look at the main types of database set operators.

The UNION operator combines two sets of results to return the result of removing duplicate rows.

In other words, it creates a result set that contains all rows belonging to both sets.

This allows you to combine two sets from the database into a single set of results.

The INTERSECT operator selects and returns only common rows from the two result sets.

In other words, it creates a result set that contains only rows that belong to both sets at the same time.

This allows you to find the intersection of two sets in the database.

The EXCEPT or MINUS operator returns a result that excludes the row of the second result set from the first result set.

That is, it creates a result set that contains only rows that belong to the first set and not to the second.

This allows you to find a difference set of two sets in the database.

The CROSS JOIN operator returns a set created by combining all rows of two tables.

That is, for each row in the first table, all rows in the second table are combined to generate a set of results.

This allows you to find all possible combinations of two tables in the database.

The JOIN operator is used to combine two or more tables into a single set of results.

Combine tables based on specific conditions and combine data based on specific columns.

There are various kinds of combining operators, such as INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL OUTER JOIN, etc.

The database set operator is utilized as an important tool for combining and segmenting data.

These operators can be appropriately utilized to easily obtain the desired results from the database.

It is important to understand and utilize the set operator well when dealing with databases.

Thank you!