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练习SELECT e.last_name,d.department_id,d.department_name FROM employees e,departments d WHERE e.depart...00637 -
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select 122106; Mysql 不支持full outer join 做满外查询 select employee_id,department_name from employees e fu...00611
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select employee_id,department_name from employees e right join departments d on e.department_id d.d...00687
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SELECT employee_id,department_name from employees e left join departments d on e.department_id d.de...00573
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外连接的分类：左外连接、有外连接、满外链接 满外连接 SELECT employee_id,department_name FROM employees e FULL OUTER JOIN depar...00574
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