SQL String Functions

String Functions

Some of the String Functions comes very handy at times. Let us discuss them one by one.

ASCII()

Returns the ASCII code value of the leftmost character of a character expression.

Syntax

ASCII ( character_expression ) 

SELECT ASCII('A') 

SET TEXTSIZE 0
SET NOCOUNT ON
-- Create the variables for the current character string position
-- and for the character string.
DECLARE @position int, @string char(15)
-- Initialize the variables.
SET @position = 1
SET @string = 'The Csharp'
WHILE @position <= DATALENGTH(@string)
   BEGIN
   SELECT ASCII(SUBSTRING(@string, @position, 1)),
      CHAR(ASCII(SUBSTRING(@string, @position, 1)))
    SET @position = @position + 1
   END
SET NOCOUNT OFF

Output:

-----------
65
----------- ----
84          T
----------- ----
104         h
----------- ----
101         e
----------- ----
and so on.....