Split text value insert another cell - sql

Question

I want split text from NAME column and insert comma separated data to PARCA column for each row. ex:
name parca
---- -------------
john j,jo,joh,john
Code:
DECLARE #i int = 0
WHILE #i < 8
BEGIN
SET #i = #i + 1
update export1 set PARCA = cast ( PARCA as nvarchar(max)) + cast (substring(NAME,1,#i) as nvarchar(max) ) +','
FROM export1
end
There are two things I can't do;
I could not equalize the #i value to name row count
I could not checked NAME column whether the value in PARCA column

Answer 1

Create this function:
create function f_parca
(
#name varchar(100)
) returns varchar(max)
as
begin
declare #rv varchar(max) = ''
if #name is not null
select top (len(#name)) #rv += ','+ left(#name, number + 1)
from master..spt_values v
where type = 'p'
return stuff(#rv, 1,1,'')
end
Testing the function
select dbo.f_parca('TClausen')
Result:
T,TC,TCl,TCla,TClau,TClaus,TClause,TClausen
Update your table like this:
UPDATE export1
SET PARCA = dbo.f_parca(name)

Answer 2

DECLARE #Count INT,#I INT
SET #I = 1
SET #Count = LEN('SURESH')
DECLARE #N VARCHAR(2000)
SET #N = ''
WHILE #Count > 0
BEGIN
SET #N = #N + ','+SUBSTRING('SURESH',1,#I)
SET #I = #I+1
SET #Count = #Count -1
END
SELECT SUBSTRING(#N,2,2000)
The above code is only a sample.'SURESH' is your name field.from which you can pass your own name values.Instead of final select u can put ur update.

Answer 3

Try this, this query will break the word into characters rows as expected then you can merge into a single row
DECLARE #Name AS Varchar(100)='Naveen'
;with cte as
(
select 1 AS Counter,CAST(SUBSTRING(#Name, 1, 1) AS Varchar(100)) Name
union all
select Counter+1,CAST((Name + ',' + SUBSTRING(#Name, Counter+1, 1))AS Varchar(100)) Name
from cte
where Len(Name) < Len(#Name) + (Len(#Name) -1)
)
select
Name
from cte
option(MAXRECURSION 0)

Answer 4

-- This query will give you exactly what you are looking for, use Emp Table with Ename as column
;with cte as
(
select 1 AS Counter,EName,CAST(SUBSTRING(E.EName, 1, 1) AS Varchar(100)) Name
From EMP E
union all
select Counter+1,E.EName,CAST((Name + SUBSTRING(E.EName, Counter+1, 1))AS Varchar(100)) Name
From EMP E
INNER JOIN CTE C ON C.Ename=E.EName
where Len(Name) < Len(E.EName)
)
select EName AS Name,
STUFF(( SELECT ',' + Name AS [text()]
FROM CTE A
WHERE
A.EName = cte.EName
FOR XML PATH('')
), 1, 1, '' )
AS Parca
from cte
Group By EName
Order By EName
option(MAXRECURSION 0)