累计金额&百分比

时间:2012-07-23 19:33:58

标签: sql-server sql-server-2005 sum

我有一个名为Sales的表:

id_sale  id_ticket  total  state
-------  ---------  -----  -----
100      100        30     inactive    
101      101        30     active    
102      101        60     active    
103      102        30     active    
104      102        30     active    
105      103        10     active    
106      103        5      active    

我需要的是获得total列的总和,当状态处于活动状态时的总和(总计)并将其乘以x百分比(我可以这样做),我必须选择全部他们的总和(所有门票总和)为<= sum(total) * x percentage并将其复制到另一张桌子(相同值)的门票

因此,如果我有票101 = 90和票102的总和= 60和票103的总和= 15,总和(总)* x百分比= 160,查询将只返回所有门票101和102的信息。

整个上午阅读我发现了一个代码,它以某种方式做了我需要的东西,但是使用了id_Sales而不是id_ticket:

    select t1.id_sale, t1.total, SUM(t2.total) as sum
    from sales t1
    inner join sales t2 on t1.id_sale >= t2.id_sale
    where t2.state='active'
    group by t1.id_sale, t1.total
    having sum(t2.total)<=(
                           select sum(total)*.65
                           from sales
                           where state='active')
    order by t1.id_sale

我期待收到的是:

id_sale  id_ticket  total  state
-------  ---------  -----  ----- 
101      101        30     active    
102      101        60     active    
103      102        30     active    
104      102        30     active

票101和票102的总和是&lt; = sum(total)* x

因此总和101和102 = 150和总和(总)* x = 160(例如)

我如何做我需要的或如何编辑此代码,以便它能够满足我的需求。

2 个答案:

答案 0 :(得分:1)

你可以从这样的事情开始:

WITH grouped_and_ranked AS (
  SELECT
    id_ticket,
    ticket_total = SUM(total),
    grand_total = SUM(SUM(total)) OVER (),
    ticket_rnk = ROW_NUMBER() OVER (ORDER BY id_ticket)
  FROM sales
  WHERE state = 'active'
  GROUP BY id_ticket
),
cumulative AS (
  SELECT
    id_ticket,
    ticket_total,
    grand_total,
    ticket_rnk,
    total_so_far = ticket_total
  FROM grouped_and_ranked
  WHERE ticket_rnk = 1
  UNION ALL
  SELECT
    r.id_ticket,
    r.ticket_total,
    r.grand_total,
    r.ticket_rnk,
    total_so_far = c.total_so_far + r.ticket_total 
  FROM grouped_and_ranked r
    INNER JOIN cumulative c ON r.ticket_rnk = c.ticket_rnk + 1
  WHERE r.ticket_total columns
)
SELECT
  s.id_sale,
  s.id_ticket,
  s.total,
  s.state
FROM sales s
INNER JOIN cumulative c ON s.id_ticket = c.id_ticket
;

第一个CTEgrouped_and_ranked检索有效销售额,并按票证计算总计以及总计(使用windowed SUM())。它还会在计算运行总计时将排名编号分配给稍后使用的故障单。

下一个CTE cumulative是一个递归CTE。只要运行总计不超过总计的指定@percent'年龄,它就会从前一个结果集中检索行。

主SELECT使用最终的故障单列表来获取详细信息行,方法是将列表连接回sales表。

可以测试此查询at SQL Fiddle

答案 1 :(得分:1)

仅使用窗口函数就可以相对轻松地完成此操作,而无需递归。

select id_sale, id_ticket, total, state
from (
  select
    id_sale, id_ticket, total, state,

    -- Now we can calculate the cumulative percentage easily
    sum(sum_per_ticket) over (order by id_sale) / sum(sum_per_ticket) over () percentage
  from (
    select
      id_sale, id_ticket, total, state,

      -- Calculate the sum per ticket and place it only on the first row per id_ticket
      -- Fill the other rows with nulls.
      case when id_sale = 
                first_value(id_sale) over (partition by id_ticket order by id_sale) 
           then sum(total) over (partition by id_ticket) end sum_per_ticket
    from sales
    where state = 'active'
  ) t
) t
where percentage <= 0.65
order by id_sale

I have blogged about calculating cumulative percentages in more detail here