ASCII

  • American Standard Code for Information Interchange.
  • Computer can understand only numbers.
  • ASCII is the numeric representation of a character.

Syntax

 SELECT CHAR(Expression)

A string function that converts an int ASCII code to a character.

Return type is CHAR.

Expression is integer value i.e. range from 0 to 255

Example

SELECT CHAR(97) AS [ASCII Character of Number 97]

SELECT ASCII('a') AS [ASCII Number of Character a]

SELECT CHAR(65) AS [ASCII Character of Number 67]

SELECT ASCII('A') AS [ASCII Number of Character A]

Output



ASCII Values

  1. Characters Set 0-31

    First 32 Characters in the ASCII table are unprintable.
  2. Characters Set 32-127

    Characters from 32-127 are common for all which represent letters, digits, punctuation marks & miscellaneous symbols.
  3. Character Set 128-255

    Characters from 128-255 contains the Microsoft Latin-1 extended characters.

    --Example to display All Number & ASCII characters

    ;WITH AllNumbers AS

    (

    SELECT 0 AS First_No

    UNION ALL

    SELECT First_No+1

    FROM AllNumbers

    WHERE First_No<255

    )

    SELECT First_No as [Numbers],

    CHAR(First_No) as [ASCII Value]

    FROM AllNumbers

    OPTION (MAXRECURSION 255)


    Syntax in Oracle

    CHR(expression [using NCHAR_CS])

    Syntax in IBM DB2, Sybase

    CHR(Expression)