SQL Server : remove duplicates and add columns - sql

Question

I have a table which has duplicate record this is how the table looks like.
ID Date Status ModifiedBy
------------------------------------------
1 1/2/2019 10:29 Assigned(0) xyz
1 1/2/2019 12:21 Pending(1) abc
1 1/4/2019 11:42 Completed(5)abc
1 1/20/2019 2:45 Closed(8) pqr
2 9/18/2018 10:05 Assigned(0) xyz
2 9/18/2018 11:15 Pending(1) abc
2 9/21/2018 11:15 Completed(5)abc
2 10/7/2018 2:46 Closed(8) pqr
What I want to do is take the minimum date value but also I want to add additional column which is PendingStartDate and PendingEndDate.
PendingStartDate: date when ID went into pending status
PendingEndDate: date when ID went from pending status to any other status
So my final output should look like this
ID AuditDate Status ModifiedBy PendingStartDate PendingEndDate
---------------------------------------------------------------------------
1 1/2/2019 10:29 Assigned(0) xyz 1/2/2019 12:21 1/4/2019 11:42
2 9/18/2018 10:05 Assigned(0) abc 9/18/2018 11:15 9/21/2018 11:15
Any help as to how to do this is appreciated.
Thanks

Answer 1

I think you want conditional aggregation:
select id, min(date) as auditdate,
max(case when seqnum = 1 then status end) as status,
max(case when seqnum = 1 then modifiedBy end) as modifiedBy,
min(case when status like 'Pending%' then date end) as pendingStartDate,
max(case when status like 'Pending%' then next_date end) as pendingEndDate
from (select t.*,
row_number() over (partition by id order by date) as seqnum,
lead(date) over (partition by id order by date) as next_date
from t
) t
group by id;

Answer 2

please try this:
Declare #Tab Table(Id int, [Date] DATETIME,[Status] Varchar(25),ModifiedBy varchar(10))
Insert into #Tab
SELECT 1,'1/2/2019 10:29','Assigned(0)','xyz' Union All
SELECT 1,'1/2/2019 11:29','Started(0)','xyz' Union All
SELECT 1,'1/2/2019 12:21','Pending(1)','abc' Union All
SELECT 1,'1/2/2019 12:21','In-Progress(1)','abc' Union All
SELECT 1,'1/4/2019 11:42','Completed(5)','abc'Union All
SELECT 1,'1/20/2019 2:45','Closed(8)','pqr' Union All
SELECT 2,'9/18/2018 10:05','Assigned(0)','xyz'Union All
SELECT 2,'9/18/2018 11:15','Pending(1)','abc' Union All
SELECT 2,'9/21/2018 11:15','Completed(5)','abc' Union All
SELECT 2,'10/7/2018 2:46','Closed(8)','pqr'
;with cte As
(
Select * ,lead(date) over (partition by id order by date) as pendingStartDate
from #Tab
Where Status in ('Assigned(0)','Pending(1)','Completed(5)')
)
,cte2 As
(
Select * , lead(pendingStartDate) over (partition by id order by date) As pendingEndDate
from cte
)
Select * from cte2 where Status ='Assigned(0)'
As you mentioned in comment, i have included few states between Assigned,pending and completed.