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CHAR (Transact-SQL)

Converts an int ASCII code to a character.

Topic link iconTransact-SQL Syntax Conventions

Syntax

CHAR ( integer_expression )

Arguments

  • integer_expression
    Is an integer from 0 through 255. NULL is returned if the integer expression is not in this range.

Return Types

char(1)

Remarks

CHAR can be used to insert control characters into character strings. The following table shows some frequently used control characters.

Control character

Value

Tab

char(9)

Line feed

char(10)

Carriage return

char(13)

Examples

A. Using ASCII and CHAR to print ASCII values from a string

The following example prints the ASCII value and character for each character in the string New Moon.

SET TEXTSIZE 0
-- Create variables for the character string and for the current 
-- position in the string.
DECLARE @position int, @string char(8)
-- Initialize the current position and the string variables.
SET @position = 1
SET @string = 'New Moon'
WHILE @position <= DATALENGTH(@string)
   BEGIN
   SELECT ASCII(SUBSTRING(@string, @position, 1)), 
      CHAR(ASCII(SUBSTRING(@string, @position, 1)))
   SET @position = @position + 1
   END
GO

Here is the result set.

----------- -

78 N

----------- -

101 e

----------- -

119 w

----------- -

32

----------- -

77 M

----------- -

111 o

----------- -

111 o

----------- -

110 n

----------- -

B. Using CHAR to insert a control character

The following example uses CHAR(13) to print the name and e-mail address of an employee on separate lines when the results are returned in text.

USE AdventureWorks2008R2;
GO
SELECT p.FirstName + ' ' + p.LastName, + CHAR(13)  + pe.EmailAddress 
FROM Person.Person p JOIN Person.EmailAddress pe
ON p.BusinessEntityID = pe.BusinessEntityID
AND p.BusinessEntityID = 1;
GO

Here is the result set.

Ken Sanchez

ken0@adventure-works.com

(1 row(s) affected)