如何限制AVG或SUM计算的值

Question

我想让AMY的结果值在300以内。

example
270 -> 270
300 -> 300
350 -> 300

我该如何修改呢？是否可以用case when in Case when？

select 
no, sum(case when type = 'A' then cost else -cost end) * 0.08 as AMY 
from MIKE
where 
MIKE.type in ('A', 'B') 
and exists (select 1 from users u where u.no = c.otaku_no)
group by no

Answer 1

您可以使用 least():

   least(sum(case when type = 'A' then cost else -cost end) * 0.08, 300) as AMY

如果sum()超过300，则return的值为300。如果你想强加一个最小值，你可以使用 greatest()。因此，这将确保该值介于 -300 和 300 之间：

   greatest(least(sum(case when type = 'A' then cost else -cost end) * 0.08, 300), -300) as AMY

如何限制AVG或SUM计算的值

How Should I do to limit the value calculated by AVG or SUM

sql

oracle11g