Comments on: SQL Puzzle: SQL Advance Query – Place NULL for repeating values

By: koustav

koustav — Wed, 30 Oct 2019 09:40:06 +0000

select
case when rnk = 1 then A else NULL end as A
,case when rnk = 1 then B else NULL end AS B
,C
,case when rnk = 1 then Code else NULL end AS Code from
(
select *, row_number()over (partition by Code,A,B order by A) as rnk from Code
) T1

By: Phanindra Suripeddi

Phanindra Suripeddi — Wed, 09 Oct 2019 18:15:19 +0000

DECLARE @Code TABLE
(
A int
,B Int
,C int
,Code CHAR(1)
)

INSERT INTO @Code
VALUES
(1,1,1,’A’)
,(1,1,2,’A’)
,(1,1,3,’A’)
,(1,1,4,’A’)
,(2,2,1,’C’)
,(2,2,2,’C’)
,(2,2,3,’C’)

;With T As
(
select *, checksum(concat(A,B,Code)) chksum From @code
)
,T2 as
(
select *,lag(chksum) Over(partition by code Order by(select null)) as lag_chksum From T
) select
case When chksum = lag_chksum then NULL else A End as A
,case When chksum = lag_chksum then NULL else B End as B
,C
,case When chksum = lag_chksum then NULL else code End as code
From T2

By: Nikhil Bhosale

Nikhil Bhosale — Tue, 13 Aug 2019 05:26:29 +0000

Select
(Case when C != ‘1’ then NULL else A end) AS A,
(Case when C != ‘1’ then NULL else B end) AS B,
C,
(Case when C != ‘1’ then NULL else code end) AS code
from code

By: Nilesh

Nilesh — Sat, 06 Jul 2019 10:48:38 +0000

Select
Case When C = 1 then A Else NULL END as A,
Case When C = 1 then B Else NULL END as B,
C,
Case When C = 1 then Code Else NULL END as Code
From Code