Full outer join

Full outer join returns all the rows from both tables whether it has been matched or not.The FULL OUTER JOIN keyword combines the result of both LEFT and RIGHT joins. 

Syntax:

SELECT
column_name(s)
FROM Table1 (Left Side Table)
FULL JOIN Table2 (Right Side Table)
ON table1.column_name=table2.column_name
 
or:
 
SELECT
column_name(s)
FROM Table1 (Left Side Table)
FULL OUTER JOIN Table2 (Right Side Table)
ON table1.column_name=table2.column_name

Example:

SELECT ProductName AS [Product Name]
,UnitPrice AS [Price]
,CategoryName AS [Product Category],ImagePath AS [Image]
 FROM Products P
FULL OUTER JOIN Categories C ON P.CategoryID=C.CategoryID

Full join t-sql query will return result 

Original Tables Data:

Products Table:

Categories Table:

Inner Join:

This join returns common or matching records/rows from both the database tables (left table and right table).This s the most used join in the SQL. In the join condition, you can also use other operators like <,>,<>.

Syntax:

SELECT
column_name(s)
FROM Table1 (Left Side Table)
INNER JOIN Table2 (Right Side Table)
ON Table1.column_name=Table2.column_name;

Example:

SELECT
ProductName AS [Product Name]
,UnitPrice AS [Price]
,CategoryName
AS [Product Category],ImagePath
AS [Image]
 FROM Products
P
INNER JOIN Categories C ON
P.CategoryID=C.CategoryID

Inner join t-sql query will return result 

Products Table

Categories Table

Right outer Join or Right join:

The RIGHT JOIN keyword returns all rows from the right table (Categories), with the matching rows in the left table (Product). The result is NULL in the left side when there is no match. 

Syntax:

SELECT
column_name(s)
FROM Table1 (Left Side Table)
RIGHT JOIN Table2 (Right Side Table)
ON table1.column_name=table2.column_name
 
or:
 
SELECT
column_name(s)
FROM Table1 (Left Side Table)
RIGHT OUTER JOIN Table2 (Right Side Table)
ON table1.column_name=table2.column_name

Example:

SELECT ProductName AS [Product Name]

,UnitPrice AS [Price]

,CategoryName AS [Product Category],ImagePath AS [Image]

 FROM Products P

RIGHT OUTER JOIN Categories C ON P.CategoryID=C.CategoryID 

Right join t-sql query will return result