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Detecting Specific Characters in a Varchar Field


Detecting Specific Characters in a Varchar Field

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Grinja
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Hi,
I would like to return the results from Varchar field where there are spaces in the field.
Is there a way to limit results to where there are empty spaces or characters such as '_ , *, .)

Any links to string manipulation would also be appreciated.

Thanks
Andras Belokosztolszki
Andras Belokosztolszki
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You can get the location of the characters you are looking for by using patindex
e.g.

declare @a varchar(10)
set @a = 'abcd a_b'

select patindex('%[ _]%', @a)


If you need to remove things, you can use replace, substring, ...

You can read on string manipulation functions that are available in T-SQL on http://msdn.microsoft.com/en-us/library/ms181984.aspx

However, if you need something more complicated, you may way to look at CLR functions.

Regards,
Andras



Andras Belokosztolszki, MCPD, PhD
GoldenGate Software
Grinja
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Thank you very much for this, this is exactly what i'm trying to accomplish.
Hehe
$QLdb@
$QLdb@
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this is really great
terrykzncs
terrykzncs
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declare @a varchar(10)
set @a = 'abcd a_b'

select patindex('%[ _]%', @a)




An alternative would be to use


declare @a varchar(10)
set @a = 'abcd a_b'
select charindex('_', @a)



I don't see a difference between the 2 functions. I posted this code as this is what I would have gone for first. Maybe someone can provide more info?
David Burrows
David Burrows
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The patindex is checking for two chars _ and space

charindex('_', @a) will return position of first _ char
patindex('%[ _]%', @a) will return position of EITHER _ or space

charindex('_', @a) and patindex('%[_]%', @a) would give the same result (ie no space)

if checking for presence of _ and space then
CHARINDEX('_', @a) > 0 AND CHARINDEX(' ', @a) > 0
would be the same as
PATINDEX('%[ _]%', @a) > 0

and it would get worse if you wanted to check for the letters a to f as you would have to OR 6 CHARINDEX
or use PATINDEX('%[a-f]%', @a)


Far away is close at hand in the images of elsewhere.

Anon.


terrykzncs
terrykzncs
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Ahem.....

Just did some investigating....Blink



declare @a varchar(10)
set @a = 'abcd a_b'
select charindex('cd', @a) -- matches a pattern - 'cd' is found in @a
select charindex('ce', @a) -- matches a pattern - 'ce' not found in @a
select patindex('%[zce]%', @a) -- treats each of the letters as seperate and tries to find any
--1 of them in @a
select patindex('%[ce]%', @a) -- same outcome as above



Still let me know if there is any other difference between the 2. It may help someone else reading this post.
terrykzncs
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Thanks David.

Didnt see your reply there as I was typing out mine. The guys here on SQL ServerCentral reply really quickSmooooth
David Burrows
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You're welcome :-)


Far away is close at hand in the images of elsewhere.

Anon.


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