How to update status based on positional value of another column

Transact-SQL
,
5

using @JeffModen DelimitedSplit8K

use sqlteam
go

create table #Ref
(
SignatureKey  nvarchar(50),
GroupId int,
PortionKey nvarchar(50),
Status nvarchar(100)
)
insert into #Ref(SignatureKey,GroupId,PortionKey,status)
values
('*$*$**$***$**$**$*',3,'s',NUll),
('*$*$*$***$*$**$*',4,'s2',NUll),
('*$*$*$***$*$**$*',6,'shd',NUll),
('*$**$*$***$***$**$*',2,'g',NUll),
('*$**$*$***$**$**$*',5,'f',NUll),
('*$*$*******$*$**$**$*',7,'f',NUll) --test extra to see accuracy 7

;with jazz
as
(
	select * 
	From #Ref r
	cross apply DelimitedSplit8K(r.SignatureKey, '$')
--this function from Sir Jeff Moden
--https://www.sqlservercentral.com/articles/tally-oh-an-improved-sql-8k-%E2%80%9Ccsv-splitter%E2%80%9D-function
)
select SignatureKey ,GroupId, PortionKey,
       case 
	      when len(item) = GroupId then 'Correct Result'
		  else 'Wrong length' 
		  end as Status
 from jazz
 where ItemNumber = 3
drop table #Ref

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