题解 | 汇总各个部门当前员工的title类型的分配数目
select dp.dept_no,dm.dept_name,t.title,count(title) from dept_emp dp left join departments dm on dp.dept_no=dm.dept_no left join titles t on dp.emp_no=t.emp_no group by dp.dept_no,t.title order by dp.dept_no,t.title
select dp.dept_no,dm.dept_name,t.title,count(title) from dept_emp dp left join departments dm on dp.dept_no=dm.dept_no left join titles t on dp.emp_no=t.emp_no group by dp.dept_no,t.title order by dp.dept_no,t.title
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