Parse column with csv string into table with one row per item

Question

I have a table (which has less than 100 rows) - ifs_tables that has two columns: localtable and Fields. Localtable is a table name and Fields contains a subset of columns from that table. Fields is a comma delimited list:  'Fname,Lname'. It looks like
this:
localtable         fields
=========  =============
customertable   fname,lname
accounttable     type,accountnumber
Want to end up with a new table that has one row per column. It should look like this:
TableName             ColumnName
============ ==========
CustomerTable        Fname
CustomerTable        Lname
AccountTable          Type
AccountTable          AccountNumber
Tried this code but have two issues (1) My query using the Splitfields functions gets "Subquery returned more than 1 value" (2) some of my Fields has hundreds of collumns in the commas delimited list. It will returns "Msg 530, Level 16, State
1, Line 8. The statement terminated. The maximum recursion 100 has been exhausted before statement completion.maxrecursion greater than 100." Tried adding OPTION (maxrecursion 0) in the Split function on the SELECT statment that calls the CTE, but
the syntax is not correct.
Can someone help me to get this sorted out? Thanks
DROP FUNCTION [dbo].[SplitFields]
go
CREATE FUNCTION [dbo].[SplitFields]
@String NVARCHAR(4000),
@Delimiter NCHAR(1)
RETURNS TABLE
AS
RETURN
WITH Split(stpos,endpos)
AS(
SELECT 0 AS stpos, CHARINDEX(@Delimiter,@String) AS endpos
UNION ALL
SELECT endpos+1, CHARINDEX(@Delimiter,@String,endpos+1)
FROM Split
WHERE endpos > 0
SELECT 'Id' = ROW_NUMBER() OVER (ORDER BY (SELECT 1)),
'Data' = SUBSTRING(@String,stpos,COALESCE(NULLIF(endpos,0),LEN(@String)+1)-stpos)
FROM Split --OPTION ( maxrecursion 0);
GO
IF OBJECT_ID('tempdb..#ifs_tables') IS NOT NULL DROP TABLE #ifs_tables
SELECT *
INTO #ifs_tables
FROM (
SELECT 'CustomerTable' , 'Lname,Fname' UNION ALL
SELECT 'AccountTable' , 'Type,AccountNumber'
) d (dLocalTable,dFields)
IF OBJECT_ID('tempdb..#tempFieldsCheck') IS NOT NULL DROP TABLE #tempFieldsCheck
SELECT * INTO #tempFieldsCheck
FROM
( --SELECT dLocaltable, dFields from #ifs_tables
SELECT dLocaltable, (SELECT [Data] FROM dbo.SplitFields(dFields, ',') ) from #ifs_tables
) t (tLocalTable, tfields) -- as Data FROM #ifs_tables
SELECT * FROM #tempFieldsCheck

Answer 1

Try this
DECLARE @DemoTable table
localtable char(100),
fields varchar(200)
INSERT INTO @DemoTable values('customertable','fname,lname')
INSERT INTO @DemoTable values('accounttable','type,accountnumber')
select * from @DemoTable
SELECT A.localtable ,
Split.a.value('.', 'VARCHAR(100)') AS Dept
FROM (SELECT localtable,
CAST ('<M>' + REPLACE(fields, ',', '</M><M>') + '</M>' AS XML) AS String
FROM @DemoTable) AS A CROSS APPLY String.nodes ('/M') AS Split(a);
Refer:-https://sqlpowershell.wordpress.com/2015/01/09/sql-split-delimited-columns-using-xml-or-udf-function/
CREATE FUNCTION ParseValues
(@String varchar(8000), @Delimiter varchar(10) )
RETURNS @RESULTS TABLE (ID int identity(1,1), Val varchar(8000))
AS
BEGIN
DECLARE @Value varchar(100)
WHILE @String is not null
BEGIN
SELECT @Value=CASE WHEN PATINDEX('%'+@Delimiter+'%',@String) >0 THEN LEFT(@String,PATINDEX('%'+@Delimiter+'%',@String)-1) ELSE @String END, @String=CASE WHEN PATINDEX('%'+@Delimiter+'%',@String) >0 THEN SUBSTRING(@String,PATINDEX('%'+@Delimiter+'%',@String)+LEN(@Delimiter),LEN(@String)) ELSE NULL END
INSERT INTO @RESULTS (Val)
SELECT @Value
END
RETURN
END
SELECT localtable ,f.Val
FROM @DemoTable t
CROSS APPLY dbo.ParseValues(t.fields,',')f
--Prashanth