Built-in function to capitalise the first letter of each word

Question

I don't want to create a custom function for that if such function already exists in SQL Server.

Input string: This is my string to convert
Expected output: This Is My String To Convert

Answer 1

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE FUNCTION [dbo].[InitCap] ( @InputString varchar(4000) ) 
RETURNS VARCHAR(4000)
AS
BEGIN

DECLARE @Index          INT
DECLARE @Char           CHAR(1)
DECLARE @PrevChar       CHAR(1)
DECLARE @OutputString   VARCHAR(4000)

SET @OutputString = LOWER(@InputString)
SET @Index = 1

WHILE @Index <= LEN(@InputString)
BEGIN
    SET @Char     = SUBSTRING(@InputString, @Index, 1)
    SET @PrevChar = CASE WHEN @Index = 1 THEN ' '
                         ELSE SUBSTRING(@InputString, @Index - 1, 1)
                    END

    IF @PrevChar IN (' ', ';', ':', '!', '?', ',', '.', '_', '-', '/', '&', '''', '(')
        SET @OutputString = STUFF(@OutputString, @Index, 1, UPPER(@Char))

    SET @Index = @Index + 1
END

RETURN @OutputString

END



Declare @str nvarchar(100)
SET @str = 'my string to convert'
SELECT @str = [dbo].[InitCap](@str)
SELECT @str