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MYSQL CROSS JOIN

The CROSS JOIN will return the records which will be the number of rows in the first table multiplied by the number of rows in the second table.

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

Then the `employeetype' with the following data

emp_type_id	emp_type
1	Full-Time
2	Contract

Syntax for CROSS JOIN

SELECT column_name(s)
FROM table_name_1
CROSS JOIN table_name_2;

Example

select employees.name,employees.location,employeetype.emp_type from employees 
cross join employeetype;

Output

name	location	emp_type
Andrew	India	Full-Time
Andrew	India	Contract
Beslin	India	Full-Time
Beslin	India	Contract

The CROSS JOIN will return all the records of both the tables irrespective of other table matches.
Query with CROSS JOIN is a costly query since it return huge volume of records.

MYSQL CROSS JOIN

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