[英]Right outer JOIN in SQL
您可以像这样将其作为outer left join
,与department_id
相关
SELECT d.department_name
FROM departments d
LEFT JOIN employees e ON e.department_id=d.department_Id
WHERE e.employee_id is null
或者更直观的版本是没有任何员工的 department_id
SELECT d.department_name
FROM departments d
WHERE NOT EXISTS (SELECT * FROM employees e WHERE e.department_id=d.department_Id )
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