# How to convert int to char with leading zerros?

I have to convert int numbers to char(4). Problem is that I have to have leading zeros there.

1 be '0001'
12 be '0012'

atc.

How to do that with simple expression?
LVL 12
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Commented:
Actually my method doesn't seem to work. But then again neither does Otana's.

But a slight variation on Otana's does :

declare @int int
declare @string char(4)

set @string = cast(right('0000' + cast(@int as varchar(4)),4) as char(4))
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Commented:
CONVERT(char(4),1) will return '   1'

So then you can use REPLACE.

declare x char(4)
set x = REPLACE(CONVERT(char(4),[your number]),' ','0')
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Commented:
declare @int int
declare @string char(4)

set @string = right('0000' + cast(@int as char(4)),4)
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Commented:
declare @x char(4)   (OOPS!)
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Commented:
It's because CASTing or CONVERTing   1 to char(4) returns '1   ', and not '   1' as I stupidly stated to start with!
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Commented:
select  right('0000' + cast( 1 as varchar(40)),4)
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Commented:
alex is right, my first solution doesn't work. However, this one does:

declare @int int
declare @string char(4)

set @int = 1

set @string = right('0000' + ltrim(rtrim(cast(@int as char(4)))),4)

select @string

This will return '0001'
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Commented:
How about just straight:

Select CASE Len(@int) WHEN 1 Then '000' + cast(@int as varchar)
when 2 Then '00' + cast(@int as varchar)
when 3 Then '0' + cast(@int as varchar)
when 4 then cast(@int as varchar) END

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Commented:
@otana let  conversion trim whitespaces ;)
right('0000' + ltrim(rtrim(cast(@int as char(4)))),4) = right('0000' + cast( @int as varchar(4)),4)

-- this is common way of adding leading zeros
right('0000' + cast( @int as varchar(4)),4)
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Commented:
That won't work because you're casting your int to a varchar of size 1 each time.
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Commented:
Nope it isn't.

It will convert the int as necessary.  ie. 3 will be converted to "3", 34 will be "34", 345 will be "345".
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Commented:
btw, my last comment was meant for SQL_Stu.
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Commented:
But you're right, my mistake. Sorry.
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Author Commented:
Endo of the test guys....I solved that.

I'll chose this:

right(cast(10000+@x as varchar),4)

Points will be split.
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Commented:
I'm terribly sorry for not guessing your expectations correctly  and would prefer my comment not beeing accepted as assisted answer than getting "C".
http://www.experts-exchange.com/Databases/Microsoft_SQL_Server/help.jsp#hi73

right('0000' + cast( @int as varchar(4)),4)
right(cast(10000+@x as varchar),4)
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Commented:
I agree. Why the 'C'? Surely we weren't that bad ??
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Author Commented:
Oh.. Sorry for that C. It was my mistake.
I wanted to give B as it is was good standard answer.

I'm working on two projects together and as third job reading EE. Sorry once more.

Is there any way how to change it?

Patrik
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Commented:
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