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Get ExcelColumn-Char from Number

Posted on 2007-11-23
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Last Modified: 2010-05-18
I'm pretty new with SQL-Server and never created a custom function.
I have a table column (int) which represents an Excel ColumnID. Now I need to display the column header.

1=A
2=B
26=Z
27=AA
28=AB....

Can anybody help.
Chris
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Question by:chriswies
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12 Comments
 
LVL 6

Accepted Solution

by:
PaultheBroker earned 2000 total points
ID: 20338451
I've done this as a function as requested, but could also just be included in the SQL
CREATE FUNCTION dbo.ColHeader_fn
	( @Int 	integer )
RETURNS varchar(2)
AS
BEGIN
	DECLARE @ColHeader varchar(2)
	if @int>26 set @ColHeader = char(64+@int/26) + char(64+@int-(26*(@int/26)))
	else set @ColHeader = char(64+@int)
RETURN @ColHeader
END
 
--USAGE
select dbo.ColHeader_fn(43)

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0
 
LVL 18

Expert Comment

by:Yveau
ID: 20338457
Try this:

Hope this helps ...
declare @Y int
set     @Y = 55
 
select  @Y
,       case
            when @Y <= 26 then char(@Y+64)
            else char(((@Y-1)/26)+64) + char(((@Y-1)%26)+65)
        end

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0
 
LVL 6

Expert Comment

by:PaultheBroker
ID: 20338467
Here is the SQL (assuming the table column with the Excel ColumnID is called [Integer]
[ColHeader] = 
case when [Integer] > 26 then char(64+[Integer]/26) + char(64+[Integer]-(26*([Integer]/26)))
	else char(64+@int) end

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Author Comment

by:chriswies
ID: 20338481
amazing, great
thank you Yveau
0
 
LVL 6

Expert Comment

by:PaultheBroker
ID: 20338516
hmmmph !
0
 

Author Comment

by:chriswies
ID: 20338547
hmmmmph!
understand, that was my fault.
Actually I want to go with the function. I hit accept on the 2nd last and that was not your solution. I didn't see your 2nd post at that time.
What is EE rule for that?
How can I go from here?
Chris
0
 
LVL 6

Expert Comment

by:PaultheBroker
ID: 20338616
Thanks for that....!!  I think you need to post a question in the Community Support, asking the Moderator to change the point allocation.  Include a link to your original question.
0
 
LVL 18

Expert Comment

by:Yveau
ID: 20338632
0
 
LVL 6

Expert Comment

by:PaultheBroker
ID: 20343449
From Yveau's solution I notice the use of the % operand - I was looking for hte MOD function - and now I've found it!!  For completeness, I've updated my solution to incorporate my new found knowledge !!!   It actually makes the equation nice and symmetrical :)  BTW: did you ever get anywhere on having the point allocation changed???
-----------------
CREATE FUNCTION dbo.ColHeader_fn
      ( @Int       integer )
RETURNS varchar(2)
AS
BEGIN
      DECLARE @ColHeader varchar(2)
      if @int>26 set @ColHeader = char(64+@int/26) + char(64+@int%26)
      else set @ColHeader = char(64+@int)
RETURN @ColHeader
END
0
 
LVL 1

Expert Comment

by:Vee_Mod
ID: 20345574
Re-opened at Asker request.


Vee_Mod
Experts Exchange Moderator
0
 
LVL 6

Expert Comment

by:PaultheBroker
ID: 20345656
Call me a perfectionist, but the IF..THEN... (or case ...when) statement has been bugging me as being somehow 'inelegant'.  So I've reworked it slightly so the whole operation is performed in a single operation.....enjoy!
ALTER FUNCTION dbo.ColHeader_fn
      ( @Int       integer )
RETURNS varchar(2)
AS
BEGIN
      DECLARE @ColHeader varchar(2)
	SET @ColHeader =REPLACE(char(64+@int/26) + char(64+@int%26),char(64),'')
RETURN @ColHeader
END

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0
 

Author Comment

by:chriswies
ID: 20917885
Hi,
I received a but report from a user that had a column 52 which is AZ but the function deliviered B@.
So I reviewed the function and found that actually the logic of Yveau brings up the right col.
Thanks Yveau!!

That is how the function looks right now:
CREATE FUNCTION dbo.ColHeader_fn3
      ( @Int       integer )
RETURNS varchar(2)
AS
BEGIN
      DECLARE @ColHeader varchar(2)
      if @int>26 set @ColHeader = char(((@int-1)/26)+64) + char(((@int-1)%26)+65)
      else set @ColHeader = char(64+@int)
RETURN @ColHeader
END
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