题解 | #统计salary的累计和running_total#
统计salary的累计和running_total
http://www.nowcoder.com/practice/58824cd644ea47d7b2b670c506a159a6
直接利用窗口函数解决！
求累计和/汇总 语句结构：SUM( 列名 )OVER( ORDER BY 列名)
select a.emp_no,a.salary, sum(a.salary) over(order by a.emp_no) as running_total from salaries a where a.to_date = '9999-01-01';
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