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MYSQL LEFT JOIN

The LEFT JOIN will return all the records from the left table and the matched records from the right table.

Syntax for LEFT JOIN

SELECT column_name(s)
FROM table_name_1
LEFT JOIN table_name_2
ON table_name_1.column_name = table_name_2.column_name;

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

Example

select employees.name,employees.location,employeetype.emp_type from employees 
left join employeetype
on employees.emp_type_id= employeetype.emp_type_id;

In the above example, the employee table is the left table which will return all the records and the employeetype is the right table which returns the matched records and unmatched records value will be null.
Output

name	location	emp_type
Andrew	India	Contract
Beslin	India	Full-Time
Joanna	USA	Full-Time
Tianna	Canada	Full-Time
Ani	USA

MYSQL LEFT JOIN

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