SQL_youtube/cross_join.sql at main · Nargis45/SQL_youtube · GitHub

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select * from departments order by dept_no;
select * from dept_manager order by dept_no;
select * from employees;

SELECT
    dm.*, d.*
FROM
    dept_manager dm
        CROSS JOIN
    departments d
ORDER BY dm.emp_no , d.dept_no;

SELECT
    dm.*, d.*
FROM
    dept_manager dm,
    departments d
ORDER BY dm.emp_no , d.dept_no;

SELECT
    dm.*, d.*
FROM
    dept_manager dm
        INNER JOIN
    departments d
ORDER BY dm.emp_no , d.dept_no;

SELECT
    dm.*, d.*
FROM
    dept_manager dm
        CROSS JOIN
    departments d
WHERE
    d.dept_no <> dm.dept_no
ORDER BY dm.emp_no , d.dept_no;


SELECT
    e.*, d.*
FROM
    departments d
        CROSS JOIN
     dept_manager dm
     join
     employees e on dm.emp_no = e.emp_no

WHERE
    d.dept_no <> dm.dept_no
ORDER BY dm.emp_no , d.dept_no;