SQL SELF JOIN

The SELF JOIN is used to join the table to itself, assuming it as two tables.

• Syntax of SELF JOIN –

SELECT A.column_name,B.column_name,... FROM Table A ,Table B WHERE condition ;

Example – Consider the Product table to use Self join.

Demo Table –

Product Table

Now, suppose we want to see those customers that belong to the same cities.

SELECT A.[Customer Name] AS Customer_Name1,B.[Customer Name] AS Customer_name2, A.City
FROM [dbo].[Products] AS A , [dbo].[Products] AS B
WHERE A.[Customer ID] != B.[Customer ID]
AND A.City = B.City ;


This output is the small section of the output by executing the above query –

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