ASCII Character in SQL Server

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

Characters Set 0-31

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

Characters from 32-127 are common for all which represent letters, digits, punctuation marks & miscellaneous symbols.
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)