Question

我希望仅当该服务日期与客户首次服务匹配时才跳过每个客户的第一个服务日期。

例如，如果客户注册1-04-2017

client enrollment date     service date

  sam      1-04-2017          1-04-2017
  sam      1-04-2017          1-04-2017
  jon      1-04-2017          1-04-2017

  jon      1-04-2017          1-05-2017 
  sam      1-04-2017          1-05-2017

  jon      1-04-2017          1-07-2017

摘要页面的预期结果

total clients     total services
  2                      4

我希望查看详细信息时的预期结果

client enrollment date     service date

  sam      1-04-2017          1-04-2017
  jon      1-04-2017          1-05-2017 
  sam      1-04-2017          1-05-2017

  jon      1-04-2017          1-07-2017

此外，您的客户还有一个注册但多个服务。考虑到查询将被上传到ssrs并且服务日期将是@begindate和@enddate之间的变量s.begindate，我如何跳过查询的第一个服务日期。

Answer 1

根据您的描述，您似乎想要一个使用窗口函数的简单where子句：

select t.*
from (select t.*,
             min(enrollment_date) over (partition by client) as first_enrollment_date
      from t
     ) t
where first_enrollment_date > service_date;

但是，这只会留下两项服务，所以目前还不清楚你真正想要的是什么。

Answer 2

根据您提供的内容，这是我猜你需要的。

CREATE TABLE T (id int identity, client varchar(10), enrollment_date date, service_date date)

--client enrollment date     service date
INSERT INTO T VALUES 
('sam','1-04-2017','1-04-2017'),
('sam','1-04-2017','1-04-2017'),
('jon','1-04-2017','1-04-2017'),
('jon','1-04-2017','1-05-2017'),
('sam','1-04-2017','1-05-2017'),
('jon','1-04-2017','1-07-2017')

DECLARE @StartDate date = '1-04-2017', @EndDate date = '1-07-2017'

SELECT COUNT(DISTINCT client) AS total_clients, COUNT(1)-COUNT(DISTINCT client) AS total_services
FROM T 
WHERE service_date BETWEEN @StartDate AND @EndDate

SELECT DISTINCT T.* 
FROM T T JOIN (SELECT client, MIN(id) AS enroll_id FROM T GROUP BY client) E
ON T.client = E.client
AND T.id <> E.enroll_id
WHERE service_date BETWEEN @StartDate AND @EndDate
ORDER BY 2, 3

DROP TABLE T

这是我从中得到的新结果。

total_clients total_services
------------- --------------
2             4

id          client     enrollment_date service_date
----------- ---------- --------------- ------------
4           jon        2017-01-04      2017-01-05
6           jon        2017-01-04      2017-01-07
2           sam        2017-01-04      2017-01-04
5           sam        2017-01-04      2017-01-05

这只会从总体计数中减去不同的客户端数量，以抵消注册事件。

希望这可以帮助你。

仅跳过第一个服务日期

2 个答案: