题解 | #汇总各个部门当前员工的title类型的分配数目#
汇总各个部门当前员工的title类型的分配数目
http://www.nowcoder.com/practice/4bcb6a7d3e39423291d2f7bdbbff87f8
select de.dept_no,d.dept_name,t.title,count(t.title) as count
FROM departments as d
JOIN dept_emp as de ON d.dept_no = de.dept_no
JOIN titles as t ON de.emp_no = t.emp_no
WHERE de.to_date = '9999-01-01' and t.to_date = '9999-01-01'
GROUP BY de.dept_no,t.title
ORDER BY de.dept_no,t.title
- 重点在于group by
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