Comments on: SQL Puzzle: SQL Advance Query – Replace NULL with Previous Non Null value

By: koustav

koustav — Wed, 30 Oct 2019 11:51:16 +0000

select *,
(select code from tbl_Values where id in(
(select max(id) from tbl_Values tbl1 where tbl1.id<=tbl.id and code is not null)))

from tbl_Values tbl

By: Phanindra Suripeddi

Phanindra Suripeddi — Mon, 19 Aug 2019 09:50:45 +0000

SELECT Id,Code, IIF(Code IS null, (SELECT TOP 1 b.Code FROM tbl_Values b WHERE b.id

By: Gregor

Gregor — Tue, 04 Jun 2019 10:59:50 +0000

select
*,
(case
when Code is not null then Code
else
(select top 1 innertbl.Code
from tbl_Values innertbl
where innertbl.Code is not null
and
innertbl.Id <= outertbl.Id
order by Id desc)
end)
as Previous_NonNullCode
from tbl_Values outertbl

By: HIC

HIC — Sat, 06 Apr 2019 20:00:41 +0000

select
a.id
, a.code
, nvl(a.code, (select b.code from tbl_Values b where b.id = (select max(c.id) from tbl_Values c where c.id < a.id and c.code is not null)))
from
tbl_Values a
order by id

By: Ram Chekuri

Ram Chekuri — Mon, 01 Apr 2019 00:34:44 +0000

with x as (
select *, sum(case when code is null then 0 else 1 end) over (order by id) rnk
from tbl_values
)

select id, code, max(code) over (partition by rnk)
from x