SQL splitfunction reverse - sql

Question

I am trying to make an SQL splitfunction which works reverse. Means
Input: 'Test1,Test2,Test3,Test4'
And the output should be:
| ID | Value |
| 1 | Test4 |
| 2 | Test3 |
| 3 | Test2 |
| 4 | Test1 |
I found a forwardworking function but I don't know what to change to make it work reversed.
I have tried some stuff but it doesn't work.
Here is the original
CREATE FUNCTION [dbo].[SplitString]
(
#InputString VARCHAR(8000),
#Delimiter CHAR(1)
)
RETURNS TABLE
AS
RETURN
(
WITH Split(StartPos,Endpos)
AS(
SELECT 0 AS StartPos, CHARINDEX(#Delimiter,#InputString) AS Endpos
UNION ALL
SELECT Endpos+1, CHARINDEX(#Delimiter,#InputString,Endpos+1)
FROM Split
WHERE Endpos > 0
)
SELECT 'Id' = ROW_NUMBER() OVER (ORDER BY (SELECT 1)),
'Value' = SUBSTRING(#InputString,StartPos
,COALESCE(NULLIF(Endpos,0)
,LEN(#InputString)+1)-StartPos)
FROM Split
)
GO
with
SELECT ID, Value
FROM dbo.SplitString('Test1,Test2,Test3,Test4', ',');
you will get the output.

Answer 1

Select * from [dbo].[udf-Str-Parse-8K-Rev]('Test1,Test2,Test3,Test4',',')
Returns
RetSeq RetVal
1 Test4
2 Test3
3 Test2
4 Test1
The UDF
CREATE FUNCTION [dbo].[udf-Str-Parse-8K-Rev] (#String varchar(max),#Delimiter varchar(25))
Returns Table
As
Return (
with cte1(N) As (Select 1 From (Values(1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) N(N)),
cte2(N) As (Select Top (IsNull(DataLength(#String),0)) Row_Number() over (Order By (Select NULL)) From (Select N=1 From cte1 a,cte1 b,cte1 c,cte1 d) A ),
cte3(N) As (Select 1 Union All Select t.N+DataLength(#Delimiter) From cte2 t Where Substring(#String,t.N,DataLength(#Delimiter)) = #Delimiter),
cte4(N,L) As (Select S.N,IsNull(NullIf(CharIndex(#Delimiter,#String,s.N),0)-S.N,8000) From cte3 S)
Select RetSeq = Row_Number() over (Order By A.N Desc)
,RetVal = LTrim(RTrim(Substring(#String, A.N, A.L)))
From cte4 A
);
--Orginal Source http://www.sqlservercentral.com/articles/Tally+Table/72993/
--Select * from [dbo].[udf-Str-Parse-8K-Rev]('Dog,Cat,House,Car',',')
Notice the Order By in the Final Select

Answer 2

you can it also do it with a query like this:
SELECT
cnt.n AS ID
, SUBSTRING_INDEX(SUBSTRING_INDEX('Test1,Test2,Test3,Test4', ',', cnt.n),',',-1) AS `VALUE` FROM
( SELECT 1 AS n UNION SELECT 2 UNION SELECT 3 UNION SELECT 4
UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9
) cnt
WHERE
cnt.n <= CHARACTER_LENGTH('Test1,Test2,Test3,Test4')
- CHARACTER_LENGTH(REPLACE('Test1,Test2,Test3,Test4',',',''))+1;
sample
MariaDB [(none)]> SELECT
-> cnt.n AS ID
-> , SUBSTRING_INDEX(SUBSTRING_INDEX('Test1,Test2,Test3,Test4', ',', cnt.n),',',-1) AS `VALUE` FROM
-> ( SELECT 1 AS n UNION SELECT 2 UNION SELECT 3 UNION SELECT 4
-> UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9
-> ) cnt
-> WHERE
-> cnt.n <= CHARACTER_LENGTH('Test1,Test2,Test3,Test4')
-> - CHARACTER_LENGTH(REPLACE('Test1,Test2,Test3,Test4',',',''))+1;
+----+-------+
| ID | VALUE |
+----+-------+
| 1 | Test1 |
| 2 | Test2 |
| 3 | Test3 |
| 4 | Test4 |
+----+-------+
4 rows in set (0.00 sec)
MariaDB [(none)]>