sqlserver 拼接字符串分割

CREATE  FUNCTION [dbo].[fnQuerySplit]
    (
      @string VARCHAR(MAX) ,--待分割字符串
      @separator VARCHAR(255)--分割符
    )
RETURNS @array TABLE ( item VARCHAR(255) )
AS
    BEGIN
        DECLARE @begin INT ,
            @end INT ,
            @item VARCHAR(255);
        SET @begin = 1;
        SET @end = CHARINDEX(@separator, @string, @begin);
        WHILE ( @end <> 0 )
            BEGIN
                SET @item = SUBSTRING(@string, @begin, @end - @begin);
                INSERT  INTO @array
                        ( item )
                VALUES  ( @item );
                SET @begin = @end + 1;
                SET @end = CHARINDEX(@separator, @string, @begin);
            END;
        SET @item = SUBSTRING(@string, @begin, LEN(@string) + 1 - @begin);
        IF ( LEN(@item) > 0 )
            INSERT  INTO @array
                    ( item
                    )
            VALUES  ( SUBSTRING(@string, @begin, LEN(@string) + 1 - @begin)
                    );
        RETURN;
    END;

CREATE  FUNCTION [dbo].[Fun_String2Table]
    (
      @str NVARCHAR(MAX) ,
      @split NVARCHAR(10)
    )
RETURNS @table TABLE ( [item] NVARCHAR(MAX) )
AS
    BEGIN
        IF LEN(@split) = 0
            BEGIN
                SET @split = N',';
            END;
  
        DECLARE @xml XML;
        SET @xml = CONVERT(XML, '<x><![CDATA['
            + REPLACE(CONVERT(VARCHAR(MAX), @str), @split,
                      ']]></x><x><![CDATA[') + ']]></x>');
  
        INSERT  INTO @table
                SELECT  item
                FROM    ( SELECT    c.value('text()[1]', 'nvarchar(4000)') [item]
                          FROM      @xml.nodes('/x') t ( c )
                        ) t
                WHERE   item IS NOT NULL;
  
        RETURN;
    END;

CREATE FUNCTION [dbo].[f_split]
    (
      @SourceSql NVARCHAR(MAX) ,
      @StrSeprate NVARCHAR(10)
    )
RETURNS @temp TABLE ( value NVARCHAR(100) )
AS
    BEGIN
        DECLARE @i INT;
        SET @SourceSql = RTRIM(LTRIM(@SourceSql));
        SET @i = CHARINDEX(@StrSeprate, @SourceSql);
        WHILE @i >= 1
            BEGIN
                INSERT  @temp
                VALUES  ( LEFT(@SourceSql, @i - 1) );
                SET @SourceSql = SUBSTRING(@SourceSql, @i + 1,
                                           LEN(@SourceSql) - @i);
                SET @i = CHARINDEX(@StrSeprate, @SourceSql);
            END;
        IF @SourceSql <> ''
            INSERT  @temp
            VALUES  ( @SourceSql );
        RETURN; 
    END;

fnQuerySplit：

Fun_String2Table：

f_split：

 因为每次执行都是不一样的时间，所以综合下来，  

Fun_String2Table 是最快的