递归分组和 count/max 给定日期时间间隔的记录

Question

我打开了另一个问题，但希望这个问题更清楚并且针对我需要帮助的内容。

示例数据：（SQL Fiddle link 包含在下面）

groupid     custid      cust_type   cust_date           data_total_1    data_total_2
CA123       ABC12345    SLE         January, 01 2014    5               10
CA123       ABC12345    SLE         February, 01 2014   2               5
CA123       ABC12345    SLE         March, 01 2014      7               11
CA123       ABC12345    SLE         April, 01 2014      7               4
FL444       BBB22222    SLE         January, 01 2014    2               3
FL444       BBB22222    SLE         March, 01 2014      7               21
FL444       BBB22222    SLE         July, 01 2014       3               9
WA999       ZZZ99909    NSLE        April, 01 2014      2               10
WA999       ZZZ99909    NSLE        May, 01 2014        4               9

对于每个给定的 groupid、custid、cust_type 组合，我需要在给定的时间间隔（3 个月）内抓取评估记录。我需要计算记录数并获取每个记录的 "range" 中存在的最大 data_total_x 值。

我的预期输出与此类似：

groupid     custid      cust_type   cust_date           custid_count    max_data_total_1    max_data_total_2
CA123       ABC12345    SLE         January, 01 2014    4               7                   11
CA123       ABC12345    SLE         February, 01 2014   3               7                   11
CA123       ABC12345    SLE         March, 01 2014      2               7                   11
CA123       ABC12345    SLE         April, 01 2014      1               7                   4
FL444       BBB22222    SLE         January, 01 2014    2               7                   21
FL444       BBB22222    SLE         March, 01 2014      1               7                   21
FL444       BBB22222    SLE         July, 01 2014       1               3                   9
WA999       ZZZ99909    NSLE        April, 01 2014      2               4                   10
WA999       ZZZ99909    NSLE        May, 01 2014        1               4                   9

SQL Fiddle 包括示例数据和我的尝试： http://sqlfiddle.com/#!6/ba5a53/10/0

如有任何帮助，我们将不胜感激。

Answer 1

我认为应该这样做：

select
  groupid,
  custid,
  cust_type,
  f.custid_count,
  f.max_data_total_1,
  f.max_data_total_2
from records r
outer apply (
  select 
    count(*) as custid_count,
    max(data_total_1) as max_data_total_1,
    max(data_total_2) as max_data_total_2
  from
    records r2
  where
    r.groupid = r2.groupid and
    r.custid = r2.custid and
    r.cust_type = r2.cust_type and
    r2.cust_date <= dateadd(month, 3, r.cust_date) and
    r2.cust_date >= r.cust_date
) f

SQL Fiddle: http://sqlfiddle.com/#!6/ba5a53/14

递归分组和 count/max 给定日期时间间隔的记录

recusively group and count/max records for a given datetime interval

sql-server

tsql

sql-server-2008-r2