Joins in SQL – SQL Joins

What is Joins in SQL?

SQL Joins is used to combine rows of two or more tables by using common values.

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Example:

Let us consider two tables first is Student details

Another table is Personal Detail.

Let us see how to join the two tables in SQL

SELECT Name, City, Marks, Phone_no
FROM Student_detail, Personal_detail
WHERE Student_details.Name=Personal_detail.Name;

Types of Joins in SQL

There are different types of Joins available in SQL:

• Inner Join in SQL
• Left Join in SQL
• Right Join in SQL
• Full Join in SQL

Inner Joins in SQL:

Inner SQL Join Query returns a value when there is a match in both the tables.

Watch this Inner Join in SQL video

Left Joins in SQL:

Left SQL Join Query returns all the values of the left table and matched the rows from the right table.

Watch this Left Join in SQL video

SELECT column_name
FROM table1
LEFT JOIN table2
ON table1.column_name=table2.column_name;

Example:

SELECT Student_details.Name, Address, Roll_no, Email_id
FROM Student_details
LEFT JOIN Personal_details
ON Student_details.Name= Personal_details.Name;

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Right Joins in SQL:

Right SQL Join Query returns all the values of the right table and matched the rows from the left table.

Watch this Right Join in SQL video

SELECT column_name
FROM table1
RIGHT JOIN table2
ON table1.column_name=table2.column_name;

Example:

SELECT Personal_details.Name, Address, Roll_no, Email_id
FROM Student_details
RIGHT JOIN Personal_details

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ON Student_details.Name= Personal_details.Name;

FULL Joins in SQL:

Full SQL Join Query returns all the rows from the left table and the right table.

Watch this Full Join in SQL video

SELECT column_name
FROM table1
FULL OUTER JOIN table2
ON table1.column_name=table2.column_name;

Example:

SELECT Student_details.Name, Roll_no, Address
FROM Student_details
FULL OUTER JOIN Personal_details
ON Student_details.Name= Personal_details.Name;

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