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MySQL Joins
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MYSQL SELF JOIN

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MYSQL SELF JOIN

The SELF JOIN is used to join the table with itself.

Syntax for SELF JOIN

SELECT column_name(s)
FROM table_name_1 T1, table_name_1 T2
WHERE condition;

Assume the table employees with the following data.

empno	name	age	department_id	location	salary	emp_type_id
1	Andrew	30	4	India	100000	2
2	Beslin	29	3	India	90000	1
3	Joanna	23	2	USA	500000	1
4	Tianna	22	4	Canada	500000	1
5	Ani	31	4	USA	700000

Then the `employeetype' with the following data

emp_type_id	emp_type
1	Full-Time
2	Contract
3	Part-Time

Example

select A.name as CustomerName1,B.name as CustomerName2, A.location from 
employees A, employees B 
where A.empno <> B.empno
and A.location = B.location;

Output

CustomerName1	CustomerName2	location
Beslin	Andrew	India
Andrew	Beslin	India
Ani	Anlin	USA
Anlin	Ani	USA

MYSQL SELF JOIN

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