SELF JOIN is a regular join used to join the table with itself.

Syntax of SELF JOIN in SQL-

SELECT <column_name(s)>

FROM <table1> t1, <table1>t2

WHERE<condition>;

Example of SELF JOIN in SQL-

SELECT A.CustomerName AS Customer1, B.CustomerName AS Customer2, A.City
FROM Customers A, Customers B
WHERE A.CustomerID <> B.CustomerID
AND A.City = B. City;

— SELF JOIN query customers that are from the same city.