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practical application of REVERSE function?


practical application of REVERSE function?

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polkadot
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Will people kindly share practical applications of REVERSE sql function? I do not see any posts on this forum addressing it and am curious.
Thanks in advance.
laurie-789651
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They must have been thinking of something when they added it. Don't know what though...
roryp 96873
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I've used it to parse out address fields that have city, state and zip in one field. It's usually easier to look through it backwards with the idea that everything up to the first space will be the zip code, and going from there.
ColdCoffee
ColdCoffee
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I use it mostly to parse out the file names from a long file path. Example:
DECLARE @FilePath VARCHAR(100)
SET @FilePath = 'C:\Users\abcd\AppData\Local\Temp\Temp.txt'
SELECT REVERSE(LEFT ( REVERSE(@FilePath) , CHARINDEX('\',REVERSE(@FilePath))))



Instead of finding the last backslash throu string splitters, i used combination of functions along with REVERSE to do the task..
Phil Parkin
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ColdCoffee (7/30/2012)
I use it mostly to parse out the file names from a long file path. Example:
DECLARE @FilePath VARCHAR(100)
SET @FilePath = 'C:\Users\abcd\AppData\Local\Temp\Temp.txt'
SELECT REVERSE(LEFT ( REVERSE(@FilePath) , CHARINDEX('\',REVERSE(@FilePath))))



Instead of finding the last backslash throu string splitters, i used combination of functions along with REVERSE to do the task..


Generalisation - sometimes you'll find that a certain character in a string is repeated several times, and you want to extract the chunk of the string between the last occurrence of this character and the end of the string.

Without REVERSE(), this would be quite involved. ColdCoffee's solution shows how easy it is with REVERSE().


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Luis Cazares
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You can use it to check if 2 phrases are palindromes.
Just kidding.


Luis C.
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polkadot
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OK, so you reverse the expression, find the character you want, perform the operation, and then reverse the expression again to aright it.
I have seen such situations arise, I now realize. Thank you CC and everyone for the responses.
Sean Lange
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Luis Cazares (7/30/2012)
You can use it to check if 2 phrases are palindromes.
Just kidding.



create function IsPalindrome(@String1 varchar(100), @String2 varchar(100))
returns table
return
(
select Case when @String1 = REVERSE(@String2) then 1 else 0 end as IsPalindrome
)

go

with cte (string1, string2)
as
(
Select 'racecar', 'racecar' union all
select 'racetruck', 'racetruck'
)

select *
from cte
cross apply dbo.IsPalindrome(string1, string2)



:-D

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Luis Cazares
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Thanks Sean, but I was joking with this because I'm not sure palindromes count as a "practical application".


Luis C.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?


How to post data/code on a forum to get the best help: Option 1 / Option 2
polkadot
polkadot
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when I said thanks to you, Luis, it was for the relationship advice, not the palindrome idea.
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