题解 | 统计salary的累计和running_total
select emp_no, salary, sum(salary)over(order by emp_no) running_total from salaries where to_date='9999-01-01' order by emp_no
select emp_no, salary, sum(salary)over(order by emp_no) running_total from salaries where to_date='9999-01-01' order by emp_no
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