That is excellent comment. I encourage every one to read this comment. http://blog.sqlauthority.com/2007/02/01/sql-server-udf-function-to-convert-text-string-to-title-case-proper-case/#comment-57503

Regards,
Pinal

1) The obvious quickie first step is to lowercase the whole string:

UPDATE Foobar
SET col_b = LOWER (col_b);

2)The first letter needs to be uppercase, so write that step:

UPDATE Foobar
SET col_b = UPPER (LEFT(col_b, 1) + RIGHT (col_b, 2);

But why not put them in one update statement?

UPDATE Foobar
SET col_b = UPPER (LEFT(LOWER (col_b), 1) + RIGHT (LOWER (col_b), 2);

3) You can then use the REPLACE() function to uppercase letters with a blank to their left by nesting calls inside each other. LISP programmers love this style of programming :)

UPDATE Foobar
SET col_b = REPLACE ..
(REPLACE
(REPLACE (REPLACE (col_b, ‘ a’, ‘A’),
‘ b’, ‘ B’),
..);

Now nest the updates again

UPDATE Foobar
SET col_b = REPLACE ..
(REPLACE
(REPLACE (UPPER (LEFT(LOWER (col_b), 1) + RIGHT (LOWER (col_b), 2), ‘ a’, ‘A’),
‘ b’, ‘ B’),
… );

This does the job in one pass thru the table and the code is portable.

CREATE FUNCTION [dbo].[Get_Person_FullName]
(
@PersonID AS INT
)
RETURNS VARCHAR(255)
AS
BEGIN

DECLARE @FullName AS VARCHAR(255)
DECLARE @LastName AS VARCHAR(100)
DECLARE @FirstName AS VARCHAR(100)
DECLARE @MiddleName AS VARCHAR(100)
DECLARE @SuffixName AS VARCHAR(100)

SELECT @LastName = LastName, @FirstName = FirstName, @MiddleName = MiddleName, @SuffixName = S.SuffixName
FROM dbo.Persons P LEFT OUTER JOIN
dbo.Persons_Suffixes S ON P.SuffixID = S.SuffixID
WHERE PersonID = @PersonID

SET @FullName = dbo.Format_TitleCase(@LastName)

IF (isnull(@FirstName,”) ”) AND @FirstName ‘The’
SET @FullName = @FullName + ‘, ‘ + dbo.Format_TitleCase(@FirstName)

IF (isnull(@MiddleName,”) ”)
SET @FullName = @FullName + ‘ ‘ + dbo.Format_TitleCase(@MiddleName)

IF (isnull(@SuffixName,”) ”)
SET @FullName = @FullName + ‘ ‘ + @SuffixName

RETURN @FullName

END

Here is your code touched up
————————————————————————–
CREATE FUNCTION [dbo].[Format_TitleCase] (@InputString VARCHAR(4000) )

RETURNS VARCHAR(max)

AS

BEGIN –BEGIN1

DECLARE @Index INT
DECLARE @Char CHAR(1)
DECLARE @OutputString VARCHAR(max)
SET @InputString = LTRIM(RTRIM(@InputString)) –cures problem where string starts with blank space
SET @OutputString = LOWER(@InputString)
SET @Index = 1
SET @OutputString = STUFF(@OutputString, 1, 1,UPPER(SUBSTRING(@InputString,1,1)))
WHILE @Index <= LEN(@InputString)
BEGIN –BEGIN2
SET @Char = SUBSTRING(@InputString, @Index, 1)
IF @Char IN ('m','M',' ', ';', ':', '!', '?', ',', '.', '_', '-', '/', '&','''','(',char(9))
BEGIN –BEGIN3
IF @Index + 1 <= LEN(@InputString)
BEGIN –BEGIN4
IF @Char = '''' AND UPPER(SUBSTRING(@InputString, @Index + 1, 1)) != 'S'
BEGIN
–MAKE THE CHARACTER AFTER AN APOST UPPER UNLESS IT IS AN S. SO O'NEIL WILL CASE CORRECTLY.
SET @OutputString = STUFF(@OutputString, @Index + 1, 1,UPPER(SUBSTRING(@InputString, @Index + 1, 1)))
END
ELSE
BEGIN
IF UPPER(@Char) != 'M'
SET @OutputString = STUFF(@OutputString, @Index + 1, 1,UPPER(SUBSTRING(@InputString, @Index + 1, 1)))
END

IF UPPER(@Char) = 'M' AND UPPER(SUBSTRING(@InputString, @Index + 1, 1)) = 'C'
BEGIN
–MAKES THE C LOWER CASE.
SET @OutputString = STUFF(@OutputString, @Index + 1, 1,LOWER(SUBSTRING(@InputString, @Index + 1, 1)))
SET @OutputString = STUFF(@OutputString, @Index + 2, 1,UPPER(SUBSTRING(@InputString, @Index + 2, 1)))
–WE TOOK CARE OF THE CHAR AFTER THE C, SO WE NEED TO ADVANCE.
SET @Index = @Index + 1
END
END –END4
END –END3

SET @Index = @Index + 1

END –END2

RETURN ISNULL(@OutputString,'')

END –END1

ex:
create procedure
declare @in
set @int=…….
orderby
case when statments…(cast..

inner join etc…

create FUNCTION udf_TitleCase (@InputString VARCHAR(max) )
RETURNS VARCHAR(max)
AS
BEGIN
DECLARE @Index INT
DECLARE @Char CHAR(1)
DECLARE @OutputString VARCHAR(max)
SET @OutputString = LOWER(@InputString)
SET @Index = 2
SET @OutputString = STUFF(@OutputString, 1, 1,UPPER(SUBSTRING(@InputString,1,1)))

WHILE @Index <= LEN(@InputString)
BEGIN
SET @Char = SUBSTRING(@InputString, @Index, 1)

IF @Char IN (‘m’,'M’,’ ‘, ‘;’, ‘:’, ‘!’, ‘?’, ‘,’, ‘.’, ‘_’, ‘-’, ‘/’, ‘&’,””,’(‘,””,char(9))
BEGIN
IF @Index + 1 <= LEN(@InputString)
BEGIN
IF @Char = ”” AND UPPER(SUBSTRING(@InputString, @Index + 1, 1)) != ‘S’
BEGIN
–MAKE THE CHARACTER AFTER AN APOST UPPER UNLESS IT IS AN S. SO O’NEIL WILL CASE CORRECTLY.
SET @OutputString = STUFF(@OutputString, @Index + 1, 1,UPPER(SUBSTRING(@InputString, @Index + 1, 1)))
END
ELSE
BEGIN
IF UPPER(@Char) != ‘M’
BEGIN
SET @OutputString = STUFF(@OutputString, @Index + 1, 1,UPPER(SUBSTRING(@InputString, @Index + 1, 1)))
END
END

IF UPPER(@Char) = ‘M’ AND UPPER(SUBSTRING(@InputString, @Index + 1, 1)) = ‘C’
BEGIN
–MAKES THE C LOWER CASE.
SET @OutputString = STUFF(@OutputString, @Index + 1, 1,LOWER(SUBSTRING(@InputString, @Index + 1, 1)))
SET @OutputString = STUFF(@OutputString, @Index + 2, 1,UPPER(SUBSTRING(@InputString, @Index + 2, 1)))
–WE TOOK CARE OF THE CHAR AFTER THE C, SO WE NEED TO ADVANCE.
SET @Index = @Index + 1
END

END
END

SET @Index = @Index + 1
END

RETURN ISNULL(@OutputString,”)
END

Also I changed the this line

IF @Char != ””
OR
UPPER(SUBSTRING(@InputString, @Index + 1, 1))
!= ‘S’

to the following to fix the function

IF @Char != ”
OR
UPPER(SUBSTRING(@InputString, @Index + 1, 1))
!= ‘ ‘

Could u tell me what are the necessary changes i have to make?
My function is the same as below:

CREATE FUNCTION udf_TitleCase (@InputString VARCHAR(4000) )
RETURNS VARCHAR(4000)
AS
BEGIN
DECLARE @Index INT
DECLARE @Char CHAR(1)
DECLARE @OutputString VARCHAR(255)
SET @OutputString = LOWER(@InputString)
SET @Index = 2
SET @OutputString =
STUFF(@OutputString, 1, 1,UPPER(SUBSTRING(@InputString,1,1)))
WHILE @Index <= LEN(@InputString)
BEGIN
SET @Char = SUBSTRING(@InputString, @Index, 1)
IF @Char IN (’ ‘, ‘;’, ‘:’, ‘!’, ‘?’, ‘,’, ‘.’, ‘_’, ‘-’, ‘/’, ‘&’,””, ‘(’, char(9))
IF @Index + 1 <= LEN(@InputString)
BEGIN
IF @Char != ””
OR
UPPER(SUBSTRING(@InputString, @Index + 1, 1))
!= ‘S’
SET @OutputString =
STUFF(@OutputString, @Index + 1, 1,UPPER(SUBSTRING(@InputString, @Index
+ 1, 1)))
END
SET @Index = @Index + 1
END
RETURN ISNULL(@OutputString,”)
END
GO

Run Following T-SQL statement in query analyzer:

SELECT dbo.udf_TitleCase(‘This function will convert this string to title
case!’)

The output will be displayed in Results pan as follows:

This Function Will Convert This String To Title Case!

But, it gave as “This Function Will Convert This string To Title Case!”. See the word “string” is not title case.

After debugging, I REMOVED the line mentioned below and it works fine for me.

IF @Char != ””
OR
UPPER(SUBSTRING(@InputString, @Index + 1, 1))
!= ‘S’

Anyways, thank you very much Pinal for saving my time.