DECLARE @StartTime DATETIME
SET @StartTime = GETDATE();

DECLARE @Position INT
DECLARE @Data VARCHAR(8000)
SET @Data = 'THIS IS ONE OF MANY REASONS WHY I DISLIKE THE AS400'

SELECT @Data = STUFF(LOWER(@Data), 1, 1, UPPER(LEFT(@Data, 1))), @Position = PATINDEX('%[^a-zA-Z][a-z]%', @Data COLLATE Latin1_General_Bin)
WHILE @Position > 0
Begin
SELECT @Data = STUFF(@Data, @Position, 2, UPPER(SUBSTRING(@Data, @Position, 2))), @Position = PATINDEX('%[^a-zA-Z][a-z]%', @Data COLLATE Latin1_General_Bin)
End

SELECT @Data
SELECT STR(DATEDIFF(ms,@StartTime,GETDATE())) + ' Milliseconds duration'

DECLARE @StringTable TABLE
(
	iPos INT IDENTITY(1,1),
	Value VARCHAR(8000)
)

INSERT INTO @StringTable (Value)
SELECT SUBSTRING(@Data,N+1,1) + SUBSTRING(LOWER(@Data),N+2,1)
FROM dbo.Tally
WHERE N <= LEN(@Data)
AND SUBSTRING(@Data,N,1) = ' '

 IF OBJECT_ID('dbo.DelimitedSplit8K') IS NOT NULL DROP FUNCTION dbo.DelimitedSplit8K
 GO
 CREATE FUNCTION dbo.DelimitedSplit8K
/***************************************************************************************************
 Purpose:
 Split a given string at a given delimiter and return a list of the split elements (items).

 Usage Example:
 SELECT *
   FROM dbo.DelimitedSplit8K(@StringToSplit, @Delimiter)

 Returns:
 iTVF containing the following:
 ItemNumber = Element position of Item as a BIGINT (not converted to INT to eliminate a CAST)
 Item       = Element value as a VARCHAR(8000)

 Notes:
 1. Optimized for VARCHAR(8000) or less.
 2. Optimized for single character delimiter.
 3. Optimized for use with CROSS APPLY.
 4. Does not "trim" elements just in case leading or trailing blanks are intended.
 5. cteTally concept originally by Iztek Ben Gan and "decimalized" by Lynn Pettis (and others) for a
    bit of extra speed and finally redacted by Jeff Moden for a different slant on readability and 
    compactness. 
 6. If you don't know how a Tally table can be used to replace loops, please see the following...
    http://www.sqlservercentral.com/articles/T-SQL/62867/

 Revision History:
 Rev 00 - 20 Jan 2010 - Jeff Moden 
        - Base 10 redaction for CTE.
 Rev 01 - 08 Mar 2010 - Jeff Moden
        - Changed UNION ALL to UNPIVOT for bit of extra speed.
 Rev 02 - 13 Mar 2010 - Jeff Moden
        - Removed one additional concatenation and one subtraction from the SUBSTRING in the 
          SELECT List.
***************************************************************************************************/
--===== Define I/O parameters
        (
        @pString    VARCHAR(8000),
        @pDelimiter CHAR(1)
        )
RETURNS TABLE
AS
RETURN
WITH --"Inline" CTE Driven "Tally Table" produces values up to 10K... enough to cover VARCHAR(8000).
      E1(N) AS (SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
                SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
                SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1),--10
      E2(N) AS (SELECT 1 FROM E1 a, E1 b),   --100
      E4(N) AS (SELECT 1 FROM E2 a, E2 b),   --10,000
cteTally(N) AS (SELECT ROW_NUMBER() OVER (ORDER BY N) FROM E4)
--===== Do the split
 SELECT ROW_NUMBER() OVER (ORDER BY N) AS ItemNumber,
        SUBSTRING(@pString, N, CHARINDEX(@pDelimiter, @pString + @pDelimiter, N) - N) AS Item
   FROM cteTally
  WHERE N < LEN(@pString) + 2
    AND SUBSTRING(@pDelimiter + @pString, N, 1) = @pDelimiter
;

select * from DelimitedSplit8K(@data, ' ') p;

SELECT STUFF((SELECT ' ' + Item
                FROM dbo.DelimitedSplit8K(@data, ' ') p
               ORDER BY ItemNumber
               FOR XML PATH ('')),1,1,'')

SELECT STUFF((SELECT ' ' + UPPER(SubString(Item,1,1)) + 
                           LOWER(SubString(Item,2,len(Item)))
                FROM dbo.DelimitedSplit8K(@data, ' ') p
               ORDER BY ItemNumber
               FOR XML PATH ('')),1,1,'')

-- Assembly
CREATE  ASSEMBLY ScalarFunctions
        AUTHORIZATION dbo
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WITH    PERMISSION_SET = SAFE;
GO
-- For strings up to 8000 bytes
CREATE  FUNCTION dbo.ToTitleCase
        (
        @Input NVARCHAR(4000)
        )
RETURNS NVARCHAR(4000) 
WITH    EXECUTE AS CALLER
AS      EXTERNAL NAME ScalarFunctions.UserDefinedFunctions.ToTitleCase;
GO
-- For LOB strings
CREATE FUNCTION dbo.ToTitleCaseMAX
        (
        @Input NVARCHAR(MAX)
        )
RETURNS NVARCHAR(MAX) 
WITH    EXECUTE AS CALLER
AS      EXTERNAL NAME ScalarFunctions.UserDefinedFunctions.ToTitleCaseMAX;

-- Test 1
SELECT  dbo.ToTitleCase(N'THIS IS ONE OF MANY REASONS WHY I DISLIKE THE AS400');
GO
-- Test 2
SELECT  dbo.ToTitleCaseMAX(definition)
FROM    msdb.sys.sql_modules;
GO

using Microsoft.SqlServer.Server;
using System.Globalization;

public partial class UserDefinedFunctions
{
    [Microsoft.SqlServer.Server.SqlFunction
        (
        DataAccess=DataAccessKind.None,
        SystemDataAccess=SystemDataAccessKind.None,
        IsDeterministic=true,
        IsPrecise=true
        )
    ]
    [return: SqlFacet (MaxSize=-1, IsNullable=false, IsFixedLength=false)]
    public static string ToTitleCaseMAX
        (
        [SqlFacet (MaxSize=-1, IsNullable=false, IsFixedLength=false)]
        string Input
        )
    {
        TextInfo ti = CultureInfo.InvariantCulture.TextInfo;
        return ti.ToTitleCase(ti.ToLower(Input));
    }

    [Microsoft.SqlServer.Server.SqlFunction
        (
        DataAccess = DataAccessKind.None,
        SystemDataAccess = SystemDataAccessKind.None,
        IsDeterministic = true,
        IsPrecise = true
        )
    ]
    [return: SqlFacet(MaxSize = 4000, IsNullable = false, IsFixedLength = false)]
    public static string ToTitleCase
        (
        [SqlFacet(MaxSize = 4000, IsNullable = false, IsFixedLength = false)]
        string Input
        )
    {
        TextInfo ti = CultureInfo.InvariantCulture.TextInfo;
        return ti.ToTitleCase(ti.ToLower(Input));
    }
};

CREATE FUNCTION [dbo].[ProperCase](@text VARCHAR(8000))
RETURNS TABLE
AS
RETURN(
  SELECT 
    A.B.value('(./text())[1]','varchar(8000)') AS [TEXT]
  FROM (
    SELECT ''+
      CASE 
        WHEN SUBSTRING(@text,N-1,1) IN ('',' ',CHAR(10),CHAR(13),CHAR(9),'.','!','(') 
          THEN UPPER(SUBSTRING(@text,N,1)) 
        ELSE LOWER(SUBSTRING(@text,N,1)) 
      END 
    FROM Tally 
    WHERE N>0 AND N<=LEN(@text) 
    FOR XML PATH(''),TYPE
    ) A(B)
)

CREATE  TABLE dbo.Shakespeare
        (
        text_data   VARCHAR(4000) NOT NULL
        );
        
BULK    INSERT dbo.Shakespeare
FROM    'C:\temp\test\shaks12.txt'
WITH    (
        DATAFILETYPE = 'char',
        CODEPAGE = 'RAW',
        FIELDTERMINATOR = '',
        ROWTERMINATOR = '.',
        TABLOCK
        );

DECLARE @BitBucket VARCHAR(4000);

SET     STATISTICS TIME ON;

-- CLR
SELECT  @BitBucket =
        dbo.ToTitleCase(S.text_data)
FROM    dbo.Shakespeare S;

-- Wayne
SELECT  @BitBucket =
        STUFF
        (
            (
            SELECT  ' ' + UPPER(SUBSTRING(Item,1,1)) + 
                           LOWER(SUBSTRING(Item,2,LEN(Item)))
            FROM    dbo.DelimitedSplit8K(S.text_data, ' ') p
            ORDER   BY 
                    ItemNumber
            FOR XML PATH (''), TYPE
            ).value('./text()[1]', 'VARCHAR(4000)')
        , 1, 1, '')
FROM    dbo.Shakespeare S;

-- Magoo
SELECT  @BitBucket =
        CA.TEXT
FROM    dbo.Shakespeare S
CROSS
APPLY   dbo.ProperCase(S.text_data) CA;

SET     STATISTICS TIME OFF;