Sql server ld只需选择[value]，行号（）在（）上方，作为字符串分割中的i…，但如前所述。。没有顺序保证..状态输出行可能是任意顺序。顺序不能保证与输入字符串中子字符串的顺序匹配 CREATE FUNCTION dbo.GetSplitString_CTE (

ld只需选择[value]，行号（）在（）上方，作为字符串分割中的i…，但如前所述。。没有顺序保证..状态

输出行可能是任意顺序。顺序不能保证与输入字符串中子字符串的顺序匹配
CREATE FUNCTION dbo.GetSplitString_CTE
(
   @List       VARCHAR(MAX),
   @Delimiter  VARCHAR(255),
   @ElementNumber int
)
RETURNS VARCHAR(4000)
AS
BEGIN

   DECLARE @result varchar(4000)    
   DECLARE @Items TABLE ( position int IDENTITY PRIMARY KEY,
                          Item VARCHAR(4000)
                         )  

   DECLARE @ll INT = LEN(@List) + 1, @ld INT = LEN(@Delimiter);  

   WITH a AS
   (
       SELECT
           [start] = 1,
           [end]   = COALESCE(NULLIF(CHARINDEX(@Delimiter, 
                       @List, @ld), 0), @ll),
           [value] = SUBSTRING(@List, 1, 
                     COALESCE(NULLIF(CHARINDEX(@Delimiter, 
                       @List, @ld), 0), @ll) - 1)
       UNION ALL
       SELECT
           [start] = CONVERT(INT, [end]) + @ld,
           [end]   = COALESCE(NULLIF(CHARINDEX(@Delimiter, 
                       @List, [end] + @ld), 0), @ll),
           [value] = SUBSTRING(@List, [end] + @ld, 
                     COALESCE(NULLIF(CHARINDEX(@Delimiter, 
                       @List, [end] + @ld), 0), @ll)-[end]-@ld)
       FROM a
       WHERE [end] < @ll
   )
   INSERT @Items SELECT [value]
   FROM a
   WHERE LEN([value]) > 0
   OPTION (MAXRECURSION 0);

   SELECT @result=Item
   FROM @Items
   WHERE position=@ElementNumber

   RETURN @result;
END
GO

declare @xml xml
set @xml = '<split><el>' + replace(@list,@Delimiter,'</el><el>') + '</el></split>'

select
    el = split.el.value('.','varchar(max)')
from  @xml.nodes('/split/el') split(el))

alter FUNCTION dbo.GetSplitString_CTE
(
   @List       VARCHAR(MAX),
   @Delimiter  VARCHAR(255),
   @ElementNumber int
)
RETURNS VARCHAR(max)
AS
BEGIN
       -- escape any XML https://dba.stackexchange.com/a/143140/65992  
       set @list = convert(VARCHAR(MAX),(select @list for xml path(''), type));

       declare @xml xml
       set @xml = '<split><el>' + replace(@list,@Delimiter,'</el><el>') + '</el></split>'

       declare @ret varchar(max)
       set @ret = (select
              el = split.el.value('.','varchar(max)')
       from  @xml.nodes('/split/el[string-length(.)>0][position() = sql:variable("@elementnumber")]') split(el))

       return @ret

END

    DECLARE @tlist varchar(max)='10,20,30,40,50,60,70,80,90,100'
    DECLARE @i INT=1, @nth INT=3
    While len(@tlist) <> 0
    BEGIN
            IF @i=@nth
            BEGIN
              select Case when charindex(',',@tlist) <> 0 Then LEFT(@tlist,charindex(',',@tlist)-1)
                          Else @tlist
                    END
            END

              Select @tlist = Case when charindex(',',@tlist) <> 0 Then substring(@tlist,charindex(',',@tlist)+1,len(@tlist))
                          Else ''
                          END

            SELECT @i=@i+1
    END

@ld INT = LEN(@Delimiter)

alter FUNCTION [dbo].[split1]
(
    @string1 VARCHAR(8000) -- List of delimited items
    , @Delimiter VARCHAR(40) = ',' -- delimiter that separates items
    , @ElementNumber int
)
RETURNS varchar(8000)
AS
BEGIN
    declare @position int
    declare @piece varchar(8000)=''
    declare @returnVal varchar(8000)=''
    declare @Pattern varchar(50) = '%' + @Delimiter + '%'
    declare @counter int =0
    declare @ld int = len(@Delimiter)
    declare @ls1 int = len (@string1)
    declare @foundit int = 0

    if patindex(@Pattern , @string1) = 0
        return  ''

    if right(rtrim(@string1),1) <> @Delimiter
        set @string1 = @string1  + @Delimiter

    set @position =  patindex(@Pattern , @string1) + @ld  -1  
    while @position > 0
    begin
        set @counter = @counter +1 
        set @ls1  = len (@string1)
        if (@ls1 >= @ld)
            set @piece = left(@string1, @position - @ld)
        else
            break
        if (@counter = @ElementNumber)
        begin
            set @foundit = 1
                break
        end
        if len(@string1) > 0
        begin
            set @string1 = stuff(@string1, 1, @position, '')
            set @position =  patindex(@Pattern , @string1) + @ld  -1  
        end
        else
        set @position = -1
    end 


    if @foundit =1
        set @returnVal = @piece
    else 
        set @returnVal =  ''
    return @returnVal

SELECT CAST('<x>' + REPLACE('1,222,2,67,888,1111',',','</x><x>') + '</x>' AS XML).value('/x[4]','int')

DECLARE @input NVARCHAR(100)=N'part1 part2 part3';
SELECT CAST(N'<x>' + REPLACE(@input,N' ',N'</x><x>') + N'</x>' AS XML).value('/x[2]','nvarchar(max)')

DECLARE @dlmt NVARCHAR(10)=N' ';
DECLARE @pos INT = 2;
SELECT CAST(N'<x>' + REPLACE(@input,@dlmt,N'</x><x>') + N'</x>' AS XML).value('/x[sql:variable("@pos")][1]','nvarchar(max)')

SET @input=N'Some <, > and &;Other äöü@€;One more';
SET @dlmt=N';';
SELECT CAST(N'<x>' + REPLACE((SELECT REPLACE(@input,@dlmt,'#DLMT#') AS [*] FOR XML PATH('')),N'#DLMT#',N'</x><x>') + N'</x>' AS XML).value('/x[sql:variable("@pos")][1]','nvarchar(max)');

DECLARE @str VARCHAR(100)='Hello John Smith';
DECLARE @position INT = 2;

--We can build the json-path '$[1]' using CONCAT
SELECT JSON_VALUE('["' + REPLACE(@str,' ','","') + '"]',CONCAT('$[',@position-1,']'));

SELECT  JsonArray.[key] AS [Position]
       ,JsonArray.[value] AS [Part]
FROM OPENJSON('["' + REPLACE(@str,' ','","') + '"]') JsonArray

DECLARE  @SomeDelimitedString VARCHAR(100)='part1|1|20190920';

DECLARE @JsonArray NVARCHAR(MAX)=CONCAT('[["',REPLACE(@SomeDelimitedString,'|','","'),'"]]');

SELECT @SomeDelimitedString          AS TheOriginal
      ,@JsonArray                    AS TransformedToJSON
      ,ValuesFromTheArray.*
FROM OPENJSON(@JsonArray)
WITH(TheFirstFragment VARCHAR(100) '$[0]'
    ,TheSecondFragment INT '$[1]'
    ,TheThirdFragment DATE '$[2]') ValuesFromTheArray

CREATE FUNCTION dbo.NTH_ELEMENT (@Input NVARCHAR(MAX), @Delim CHAR = '-', @N INT = 0)
RETURNS NVARCHAR(MAX)
AS
BEGIN
RETURN (SELECT VALUE FROM STRING_SPLIT(@Input, @Delim) ORDER BY (SELECT NULL) OFFSET @N ROWS FETCH NEXT 1 ROW ONLY)
END

  CREATE TABLE #tblVals(Id INT IDENTITY(1,1), Val NVARCHAR(100))
  INSERT INTO #tblVals (Val)
  SELECT [value] FROM STRING_SPLIT('Val1-Val3-Val2-Val5', '-')
  SELECT * FROM #tblVals

DECLARE @val2 NVARCHAR(100) = (SELECT TOP 1 Val FROM #tblVals WHERE Id = 2)

DECLARE @Input VARCHAR(100) = '1a,2b,3c,4d,5e,6f,7g,8h'
       ,@Number TINYINT = 3

DECLARE @XML XML;
DECLARE @value VARCHAR(100);

SET @XML = CAST('<x>' + REPLACE(@Input,',','</x><x>') + '</x>' AS XML);

WITH DataSource ([rowID], [rowValue]) AS
(
    SELECT ROW_NUMBER() OVER (ORDER BY T.c ASC) 
            ,T.c.value('.', 'VARCHAR(100)')
    FROM @XML.nodes('./x') T(c)
)
SELECT @value = [rowValue]
FROM DataSource
WHERE [rowID] = @Number;

SELECT @value;

SELECT value, idx FROM
(
  SELECT
    value,
    ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) idx
  FROM STRING_SPLIT('Lorem ipsum dolor sit amet.', ' ')
) t
WHERE idx=2