Oracle 外连接实现代码
1. LEFT OUTER JOIN:左外关联 SELECT e.last_name, e.department_id, d.department_name FROM employees e LEFT OUTER JOIN departments d ON (e.department_id = d.
1. LEFT OUTER JOIN:左外关联 SELECT e.last_name, e.department_id, d.department_name FROM employees e LEFT OUTER JOIN departments d ON (e.department_id = d.
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