如何用 MYSQL 中的总和过滤 window 函数？

Question

如何编写此查询以仅过滤大于 50 的总和？我不能让它与 having 或 sum 一起工作，但我确定有一些方法。

select name, sum(score) 
    from submissions inner join hacker on submissions.hacker_id = hacker.hacker_id
    group by submissions.hacker_id
    order by sum(score) desc
    having sum(score) > 50

Fiddle 和表格在这里（它们没有什么不寻常的，这个查询运行时没有最后一行但是 returns 每个人的分数和名字）：http://sqlfiddle.com/#!9/7a660d/16

Answer 1

您的订单应该在您拥有之后。即


select 
    name, 
    sum(score) 
from 
    submissions 
inner join 
    hacker on submissions.hacker_id = hacker.hacker_id
group by 
    submissions.hacker_id
having 
    sum(score) > 50 
order by 
    sum(score) desc

Answer 2

排序应该在最后

select name, sum(score) 
from submissions 
inner join hacker on submissions.hacker_id = hacker.hacker_id
group by submissions.hacker_id
having sum(score) > 50 
order by sum(score) desc

Answer 3

您也可以在求和语句中使用 CASE。这种方法适用于 windows 函数，尽管我还没有针对普通的总和聚合函数对其进行测试选项 1（案例总和）：

select name, sum(case when score>50 else 0 end) 
from submissions inner join hacker on submissions.hacker_id = hacker.hacker_id
group by submissions.hacker_id
order by sum(score) desc

选项 2 Windows 函数：

select name, 
sum(case when score>50 else 0 end) over (partition by submissions.hacker_id)
from submissions inner join hacker on submissions.hacker_id = hacker.hacker_id
group by submissions.hacker_id

order by 子句稍有变化，因此我将其省略，但您随时可以再次添加

如何用 MYSQL 中的总和过滤 window 函数？

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