SQL query to find results with no gap in dates - sql-server

Question

I have a table with ClaimNumber, NoteCreateDate, NoteType
I wanted to find the claims that has notes like 'Review sent' back to back with no gap in the NoteCreateDate
eg.
+-------------+----------------+--------------------+----------+
| ClaimNumber | NoteCreateDate | Notes | NoteType |
+-------------+----------------+--------------------+----------+
| 12121 | 12/01/2017 | ReviewSent | Subject |
| 12121 | 12/05/2017 | PackagesenttoABC | Details |
| 12121 | 12/07/2017 | ReviewSent | Subject |
| 10005 | 05/06/2018 | ReviewSent | Subject |
| 10005 | 05/07/2018 | ReviewSent | Subject |
| 10005 | 05/08/2018 | ReviewSent | Subject |
| 10005 | 05/12/2018 | Fieldinvestigation | SIU |
+-------------+----------------+--------------------+----------+
Expected
From this example I wanted only the claim number 10005 since it the claim that has the notes 'Review Sent' back to back with no gap in the date(consecutive Dates). For instance, I wanted to find the claims that has the note with phrase 'ReviewSent' created today and the following note should also be the same 'Review sent', no matter when it was created, May be the next day or even 10 days later .. Thanks in Advance
My current MS SQL query.
select cm.ClaimNum, a.NoteCreateDate, a.Notes, a.NoteType
from CMaster cm
left join Note a on cm.ClaimNum = a.PARENTREF
left join NoteType] b on b.ID = a.TYPECODE
where Body like '%Review Sent%'

Answer 1

So if you want to find the ClaimNumber(s) where the ReviewSent notes are sent back-2-back then this query will get them
CREATE TABLE T1
([ClaimNumber] int, [NoteCreateDate] datetime, [Notes] varchar(18), [NoteType] varchar(7))
;
INSERT INTO T1
([ClaimNumber], [NoteCreateDate], [Notes], [NoteType])
VALUES
(12121, '2017-12-01 00:00:00', 'ReviewSent', 'Subject'),
(12121, '2017-12-05 00:00:00', 'PackagesenttoABC', 'Details'),
(12121, '2017-12-07 00:00:00', 'ReviewSent', 'Subject'),
(10005, '2018-05-06 00:00:00', 'ReviewSent', 'Subject'),
(10005, '2018-05-07 00:00:00', 'ReviewSent', 'Subject'),
(10005, '2018-05-08 00:00:00', 'ReviewSent', 'Subject'),
(10005, '2018-05-12 00:00:00', 'Fieldinvestigation', 'SIU')
;
SELECT DISTINCT X.ClaimNumber
FROM(
SELECT
ClaimNumber
,NoteCreateDate
,Notes
,NoteType
,LD=LEAD( Notes )OVER(PARTITION BY ClaimNumber ORDER BY NoteCreateDate ASC)
FROM dbo.T1
) X WHERE LD= 'ReviewSent' AND X.Notes= 'ReviewSent'
DROP TABLE dbo.T1
Result
ClaimNumber
10005

Answer 2

Select * into #tmp
from
(
Select 12121 as ClaimNumber,'12/01/2017' as
NoteCreateDate,'ReviewSent' as Notes,'Subject' as NoteType
union
Select 12121 , '12/05/2017' , 'PackagesenttoABC' , 'Details'
union
Select 12121 , '12/07/2017' , 'ReviewSent' ,
'Subject'
union
Select 10005 , '05/06/2018' , 'ReviewSent' , 'Subject'
union
Select 10005 , '05/07/2018' , 'ReviewSent' ,
'Subject'
union
Select 10005 , '05/08/2018' , 'ReviewSent' , 'Subject'
union
Select 10005 , '05/12/2018' , 'Fieldinvestigation' , 'SIU'
) t
/*create another temp table to simplify the query*/
Select * , ROW_NUMBER() OVER (PARTITION BY ClaimNumber ORDER BY
ClaimNumber)
as ClaimCounter into #tmp2 from #tmp
/** finally get the claimnos that have consecutive NoteCreate Date **/
SELECT distinct t1.ClaimNumber FROM #tmp2 t1
inner join #tmp2 t2 on (t1.ClaimCounter = t2.ClaimCounter - 1 and
t1.ClaimNumber = t2.ClaimNumber)
where
DATEDIFF(DAY,t1.NoteCreateDate,t2.NoteCreateDate) = 1
and
t1.Notes ='ReviewSent' and t2.Notes ='ReviewSent'