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Replacing partially duplicated string ?

Author

Topic

Windza
Yak Posting Veteran

61 Posts

Posted - 2008-11-25 : 22:17:31

I have two columns (A & B) containing strings of which one (B) sometimes has the duplicate of A with an appended string...
e.g.
|-----A-----|-----B---------|
|help-------|helpme---------|
|please-----|pleasethankyou-|
|very-------|much-----------|

What I'm hoping for is a query to check for partial duplication and create another column (C) that displays B - A where a duplication is detected, or else simply duplicates B...

i.e.
|-----A-----|-----B---------|----C----|
|help-------|helpme---------|me-------|
|please-----|pleasethankyou-|thankyou-|
|very-------|much-----------|much-----|

Is this type of manipulation achievable with string fields ?
As always - any assistance is greatly appreciated..
Regards,
Windza

pbguy
Constraint Violating Yak Guru

319 Posts

Posted - 2008-11-25 : 22:41:20

it is easy...
declare @t table(Col1 varchar(50), col2 varchar(50))
insert @t
select 'help', 'helpme' union all
select 'please', 'pleasethankyou' union all
select 'very', 'much'

select col1, col2,
replace(col2, col1, '') as col3
from @t

--------------------------------------------------
S.Ahamed

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-11-25 : 23:29:26

Another way

SELECT A,B,COALESCE(STUFF(B,PATINDEX('%'+A+'%',B),LEN(A),''),B) AS C FROM @test

Windza
Yak Posting Veteran

61 Posts

Posted - 2008-11-25 : 23:40:46

My word - that was easy... thank-you. I think I made the assumption it wasn't going to be easy and looked only for a difficult answer !

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