SQL-Server-Tutorial/SQL Server Joins.sql at main · krasigarev/SQL-Server-Tutorial · GitHub

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-- Left Join

SELECT
    c.id candidate_id,
	c.fullname candidate_name,
	e.id employee_id,
	e.fullname employee_name
FROM hr.candidates AS c
LEFT JOIN hr.employees as e  ON e.fullname = c.fullname;
GO

SELECT
    c.id candidate_id,
	c.fullname candidate_name,
	e.id employee_id,
	e.fullname employee_name
FROM hr.candidates AS c
LEFT JOIN hr.employees as e  ON e.fullname = c.fullname
WHERE e.[id] IS NULL;
GO

-- Right Join

SELECT
    c.id candidate_id,
	c.fullname candidate_name,
	e.id employee_id,
	e.fullname employee_name
FROM hr.candidates AS c
RIGHT JOIN hr.employees as e  ON e.fullname = c.fullname;
GO

SELECT
    c.id candidate_id,
	c.fullname candidate_name,
	e.id employee_id,
	e.fullname employee_name
FROM hr.candidates AS c
RIGHT JOIN hr.employees as e  ON e.fullname = c.fullname
WHERE c.[id] IS NULL;
GO


-- full join

SELECT
    c.id candidate_id,
	c.fullname candidate_name,
	e.id employee_id,
	e.fullname employee_name
FROM hr.candidates AS c
FULL JOIN hr.employees as e  ON e.fullname = c.fullname;
GO


SELECT
    c.id candidate_id,
	c.fullname candidate_name,
	e.id employee_id,
	e.fullname employee_name
FROM hr.candidates AS c
FULL JOIN hr.employees as e  ON e.fullname = c.fullname
WHERE c.ID IS NULL OR E.id IS NULL;
GO

-- Jons
SELECT
payment
FROM salary, ranks, jobs
WHERE salary.rank = ranks.rank
AND ranks.title = jobs.title
AND jobs.employee = 'Bob Doe'