Sql server 2008 对不起，我必须更明确一点，不要把一半的问题记在心里。让我重新开始。当前，您的示例包含作业3的一行，时间在2月之前。您的要求规定了转到New列的百分比。相应的Old值显示为0，我试图为自己澄清为什么在本例中它是0。是否因为源中的单个数据行的日期在2月之前（即

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对不起，我必须更明确一点，不要把一半的问题记在心里。让我重新开始。当前，您的示例包含作业3的一行，时间在2月之前。您的要求规定了转到

New

列的百分比。相应的

Old

值显示为0，我试图为自己澄清为什么在本例中它是0。是否因为源中的单个数据行的日期在2月之前（即规定的期限之前）？还是仅仅因为它是一行，即它没有前置行。。。因此，同样，如果存在一个（另一个）作业3行，

日期

值早于

2013年1月15日

（当前作业3行也保留在集合中），则作业3的

旧

必须保留

0

，还是需要显示另一行的

完成百分比

？（我在这里假设，

New

无论如何仍然是5。）为了节省时间，我当前的解决方案将是

Old

（如果前面没有行，则为0，如您当前的示例中所示）@然而，伊恩·普雷斯顿的解决方案仍然是可行的。（我希望Ian收到有关此评论的通知，以提醒其解决方案可能存在的问题。尽管我们双方仍需要您澄清这是否是一个问题。）感谢您的工作。我会在本周初仔细查看它，并让你知道它是如何工作的。我没有把它拆开来找出原因，但它似乎从大约1500个不同的工作表中跳过了大约100个工作。不过，感谢您的帮助。它可能会跳过新的作业，即在报告月份之后首次登录的作业。无论如何，如果你想继续前进，我理解。此外，您接受的解决方案比我的更短/更简单，因此可能更易于维护。即使是这样，你也必须对它感到满意（大概是次要的）。

Job      Date         Percent_complete
---      ----         ----------------
1        1/5/2013     5
2        1/10/2013    5
2        1/25/2013    15
2        2/15/2013    25
3        2/15/2013    5
1        2/10/2013    10
1        2/23/2013    20
1        2/24/2013    18
4        1/12/2013    40

Job   Old    New
---   ---    ---
1     5      18
2     15     25
3     0      5
4     40     40

with max_percent as
(
  select Job
    , [Max] = max(Percent_complete)
  from jobs
  where [Date] between '2/1/2013' and '2/28/2013'
  group by Job
),
min_percent as
(
  select Job
    , [Max] = max(Percent_complete)
  from jobs
  where [Date] < '2/1/2013'
  group by Job
)
select Job = coalesce(mn.Job, mx.Job)
  , [Min] = case when mx.Job is not null then mn.[Max] else 0 end
  , [Max] = coalesce(mx.[Max], mn.[Max], 0)
from max_percent mx
  full join min_percent mn on mx.Job = mn.Job
order by Job

with jobList as
(
  select distinct Job from jobs
)
select Job
  , [Min] = isnull(case when mx.[Max] is not null then mn.[Max] else 0 end, 0)
  , [Max] = coalesce(mx.[Max], mn.[Max], 0)

from jobList jl
  outer apply
  (
    select top 1 [Max] = j.Percent_complete
    from jobs j
    where [Date] between '2/1/2013' and '2/28/2013'
      and jl.Job = j.Job
    order by j.[Date] desc
  ) mx
  outer apply
  (
    select top 1 [Max] = j.Percent_complete
    from jobs j
    where [Date] < '2/1/2013'
      and jl.Job = j.Job
    order by j.[Date] desc
  ) mn
order by jl.Job

with jobList as
(
  select distinct Job from jobs
)
select Job
  , [Min] = isnull(mn.[Max], 0)
  , [Max] = coalesce(mx.[Max], mn.[Max], 0)

from jobList jl
  outer apply
  (
    select top 1 [Max] = j.Percent_complete
    from jobs j
    where [Date] between '2/1/2013' and '2/28/2013'
      and jl.Job = j.Job
    order by j.[Date] desc
  ) mx
  outer apply
  (
    select top 1 [Max] = j.Percent_complete
    from jobs j
    where [Date] < '2/1/2013'
      and jl.Job = j.Job
    order by j.[Date] desc
  ) mn
order by jl.Job

Job Date Percent_complete recency --- ---- ---------------- ------- 1 1/5/2013 5 Old 2 1/10/2013 5 Old 2 1/25/2013 15 Old 2 2/15/2013 25 New 3 1/15/2013 5 New 1 2/10/2013 10 New 1 2/23/2013 20 New 1 2/24/2013 18 New 4 1/12/2013 40 Old Job Date Percent_complete recency rnk --- ---- ---------------- ------- --- 1 1/5/2013 5 Old 1 2 1/10/2013 5 Old 2 2 1/25/2013 15 Old 1 2 2/15/2013 25 New 1 3 1/15/2013 5 New 1 1 2/10/2013 10 New 3 1 2/23/2013 20 New 2 1 2/24/2013 18 New 1 4 1/12/2013 40 Old 1 Job Date Percent_complete recency rnk --- ---- ---------------- ------- --- 1 1/5/2013 5 Old 1 2 1/25/2013 15 Old 1 2 2/15/2013 25 New 1 3 1/15/2013 5 New 1 1 2/24/2013 18 New 1 Job Old New --- --- --- 1 5 18 2 15 25 3 0 5

WITH partitioned AS (
  SELECT
    Job,
    Date,
    Percent_complete,
    recency = CASE
      WHEN Date >= '20130201' THEN 'NEW'
      ELSE 'Old'
    END
  FROM atable
  WHERE Date < '20130301'
)
, ranked AS (
  SELECT
    Job,
    Date,
    Percent_complete,
    recency,
    rnk = ROW_NUMBER() OVER (PARTITION BY Job, recency ORDER BY Date DESC)
  FROM partitioned
)
, filtered AS (
  SELECT
    Job,
    Percent_complete,
    recency
  FROM ranked
  WHERE rnk = 1
)
, pivoted AS (
  SELECT
    Job,
    Old = ISNULL(Old, 0),
    New = ISNULL(New, Old)
  FROM filtered
  PIVOT (
    MAX(Percent_complete) FOR recency IN (Old, New)
  ) u
)
SELECT *
FROM pivoted
;