sql-server,tsql,sql-server-2008-r2 , How to get Duplicate records from single table depends on column value?
How to get Duplicate records from single table depends on column value?
I got table like this:
declare @t1 table(Pat_Ref int,Fname VARCHAR(20), Sname VARCHAR(20),minor VARCHAR(1),SourceSys VARCHAR(40),regdt datetime)
insert into @t1
values (111,'John', 'Wayne','N','ick','2015-06-09 21:31:09.253')
,(111,'John', 'Wayne','N','ick','2014-05-09 21:31:09.253')
,(111,'John', 'Wayne',null,'hpk','2015-04-09 21:31:09.253')
,(112,'Jill', 'Smith','N','ick','2015-01-08 21:31:09.253')
,(112,'Jill', 'Smith',null,'hpk','2015-05-01 21:31:09.253')
,(113,'Bill', 'Peyton','N','ick','2015-06-09 21:31:09.253')
,(114,'Gill', 'Peyton','N','hpk','2015-06-09 21:31:09.253')
,(114,'Gill', 'Peyton','N','hpk','2015-06-12 21:31:09.253')
,(114,'Gill', 'Peyton','N','ick','2006-10-22 21:31:09.253')
,(115,'Billy', 'Peyton','N','hpk','2015-06-09 21:31:09.253')
,(116,'William', 'nixon','N','ick','2015-06-09 21:31:09.253')
,(116,'William', 'nixon','N','ick','2015-06-09 21:31:09.253')
I want duplicate records based on
Pat_Ref and values between
SourceSys column. If duplicate record found row must be recent date
Note: From the above table
Pat_Ref=116, there are two rows but it can't be duplicate because its
SourceSys value is same
ick. if that value is
ick on row and
hpk on another row then it can become duplicate row.
I want result like this;
Pat_Ref Fname Sname minor SourceSys regdt
111 John Wayne N ick 2015-06-09 21:31:09.253
112 Jill Smith NULL hpk 2015-05-01 21:31:09.253
114 Gill Peyton N hpk 2015-06-12 21:31:09.253
Any help. Thanks
I hope I understood you right, that's the query I came up with and and it does seem to return expected results:
SELECT Pat_Ref, Fname, Sname, minor, SourceSys, regdt
SELECT ROW_NUMBER() OVER (PARTITION BY Pat_ReF ORDER BY regdt DESC) AS RN, *
) AS T
CROSS APPLY (
FROM @t1 AS T2
WHERE T2.Pat_Ref = T.Pat_Ref
AND T2.SourceSys BETWEEN 'hck' AND 'ick'
GROUP BY T2.Pat_Ref
HAVING COUNT(DISTINCT T2.SourceSys) > 1
) AS T2(UQ)
WHERE T.RN = 1;
Explanation: I'm using
ROW_NUMBER() to get most recent
regdt for each
Pat_Ref in case it needs to be filtered.
And I'm using
CROSS APPLY to get DISTINCT
COUNT() for each
SourceSys and if I understood it right, it must match both ICK and HCK.
Any questions - let me know.
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