How can I use the Venn diagram joins in SQL for retrieval of data?

266    Asked by Bhaanumatishukla in SQL Server , Asked on Jan 10, 2024

 I am assigned a task that is related to the retrieval of data from a complex database structure that includes multiple tables. The tables are connected by various relationships. How can I use the concept of Venn diagram joins in SQL for the retrieval of data? 

 In the context of SQL, the Venn diagram is used to retrieve data by using different logical combinations such as INNER, OUTER, LEFT and RIGHT joins.

Here is the explanation given of each join which is mentioned above:-

Inner joins

This is used when there is a match in both tables:-

SELECT *
FROM table1
INNER JOIN table2 ON table1.column = table2.column

Left joins

It is used in the retrieval of data from the left side and matching the rows from the right table.

SELECT *
FROM table1
LEFT JOIN table2 ON table1.column = table2.column

Right joins

It is used in the retrieval of data from the right side and matching the rows from the right table.

SELECT *
FROM table1
RIGHT JOIN table2 ON table1.column = table2.column

Outer joins

It is used as a combination of both left and right joins. This captures all rows from both the tables and then aligns the matches.

SELECT *
FROM table1
FULL OUTER JOIN table2 ON table1.column = table2.column


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