我正在尝试创建一个用于分析的数据集,其中包含每日交易以及未进行任何交易的日期。
理想的结果与Count(后续0' s)列相同。我已经尝试过运行总计,但还没有找到一种方法只计算带有' 0'在事务列中,然后在事务列为<>时重置计数0
由于
答案 0 :(得分:0)
我在SQL Server 2016 SP1(13.0.4001.0)中解决了此问题。这看起来像是“序列中的间隙和孤岛”问题,我的解决方案是Dwain Camps对示例之一的修改。
注意:原始示例列出了一个帐号,但解决方案可满足多个帐号的要求。
with TestData as
(
-- data for Mr Bill Withers (account number 11300)
select CONVERT(date, '29/06/2016', 103) as CalendarDate, 11300 as AccountNumber, 'Mr Bill Withers' as AccountName, 1 as Transactions
union
select CONVERT(date, '30/06/2016', 103) as CalendarDate, 11300 as AccountNumber, 'Mr Bill Withers' as AccountName, 3 as Transactions
union
select CONVERT(date, '01/07/2016', 103) as CalendarDate, 11300 as AccountNumber, 'Mr Bill Withers' as AccountName, 2 as Transactions
union
select CONVERT(date, '02/07/2016', 103) as CalendarDate, 11300 as AccountNumber, 'Mr Bill Withers' as AccountName, 0 as Transactions
union
select CONVERT(date, '03/07/2016', 103) as CalendarDate, 11300 as AccountNumber, 'Mr Bill Withers' as AccountName, 0 as Transactions
union
select CONVERT(date, '04/07/2016', 103) as CalendarDate, 11300 as AccountNumber, 'Mr Bill Withers' as AccountName, 4 as Transactions
union
select CONVERT(date, '05/07/2016', 103) as CalendarDate, 11300 as AccountNumber, 'Mr Bill Withers' as AccountName, 3 as Transactions
union
select CONVERT(date, '06/07/2016', 103) as CalendarDate, 11300 as AccountNumber, 'Mr Bill Withers' as AccountName, 0 as Transactions
union
select CONVERT(date, '07/07/2016', 103) as CalendarDate, 11300 as AccountNumber, 'Mr Bill Withers' as AccountName, 0 as Transactions
union
select CONVERT(date, '08/07/2016', 103) as CalendarDate, 11300 as AccountNumber, 'Mr Bill Withers' as AccountName, 0 as Transactions
union
select CONVERT(date, '09/07/2016', 103) as CalendarDate, 11300 as AccountNumber, 'Mr Bill Withers' as AccountName, 0 as Transactions
union
select CONVERT(date, '10/07/2016', 103) as CalendarDate, 11300 as AccountNumber, 'Mr Bill Withers' as AccountName, 1 as Transactions
union
-- data for Mr Bob Builder (account number 11301)
select CONVERT(date, '29/06/2016', 103) as CalendarDate, 11301 as AccountNumber, 'Mr Bob Builder' as AccountName, 1 as Transactions
union
select CONVERT(date, '30/06/2016', 103) as CalendarDate, 11301 as AccountNumber, 'Mr Bob Builder' as AccountName, 0 as Transactions
union
select CONVERT(date, '01/07/2016', 103) as CalendarDate, 11301 as AccountNumber, 'Mr Bob Builder' as AccountName, 0 as Transactions
union
-- data for Mr Ted Teddy (account number 11302)
select CONVERT(date, '29/06/2016', 103) as CalendarDate, 11302 as AccountNumber, 'Mr Ted Teddy' as AccountName, 0 as Transactions
-- add data for additional account numbers...
),
StartingPoints as
(
select AccountNumber, CalendarDate, Transactions,
ROW_NUMBER() over(partition by AccountNumber order by CalendarDate) as rownum
from TestData as A
where not exists (
select *
from TestData as B
where B.AccountNumber = A.AccountNumber and Transactions = 0 and dateadd(day, 1, B.CalendarDate) = A.CalendarDate
)
and Transactions = 0
),
EndingPoints as
(
select AccountNumber, CalendarDate, Transactions,
ROW_NUMBER() over(partition by AccountNumber order by CalendarDate) as RowNum
from TestData as A
where not exists (
select *
from TestData as B
where B.AccountNumber = A.AccountNumber and Transactions = 0 and dateadd(day, -1, B.CalendarDate) = A.CalendarDate
)
and Transactions = 0
),
ZeroTransactionRanges as
(
SELECT S.AccountNumber, S.CalendarDate AS start_range, E.CalendarDate AS end_range
FROM StartingPoints AS S
INNER JOIN EndingPoints AS E ON E.AccountNumber = S.AccountNumber AND E.RowNum = S.RowNum
),
ZeroRunLengths as
(
select CalendarDate,
t1.AccountNumber,
datediff(day, start_range, CalendarDate) + 1 as runLength
from ZeroTransactionRanges as t1
INNER JOIN TestData as t2
on t1.AccountNumber = t2.AccountNumber
where start_range <= t2.CalendarDate and t2.CalendarDate <= end_range
)
select t1.*,
case when t2.runLength is null then 0 else t2.runLength end as 'Count(Subsequent 0s)'
from TestData as t1
-- note the LEFT join here!
LEFT JOIN ZeroRunLengths as t2
on t1.AccountNumber = t2.AccountNumber and t1.CalendarDate = t2.CalendarDate
order by AccountNumber, CalendarDate