题解 | 60#统计salary的累计和running_total#
统计salary的累计和running_total
http://www.nowcoder.com/practice/58824cd644ea47d7b2b670c506a159a6
select emp_no,salary,sum(salary) over (order by emp_no) running_total from salaries where to_date='9999-01-01'
思路:熟悉窗口函数的使用
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