SELECT DIFFERENCE('Hello','World') = 1 ..?

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Why did the following statement in SQL SERVER 2008
RETURN 1 AS OUTPUT

SELECT DIFFERENCE('Hello','World')

I read the Wikipedia for the answer I got it but I didn't understand...

Posted 17-Dec-14 22:33pm

K.Y.S.Phaneendra

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3 solutions

Solution 1

The documentation is pretty clear : DIFFERENCE (Transact-SQL)[^]

Posted 17-Dec-14 22:49pm

Mehdi Gholam

Comments

Maciej Los 18-Dec-14 5:10am

+5

Mehdi Gholam 18-Dec-14 5:17am

Thanks!

Solution 3

SOUNDEX CODE ALGORITHM IS EXPLAINED HERE

http://www.gedpage.com/soundex.html[^]

Posted 17-Dec-14 23:53pm

K.Y.S.Phaneendra

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Jan Bakker · Accepted Answer · 2014-12-17T23:00:00

Difference always returns a value from 0 to 4.

In this case it compares "Hello" with "World".
So how much does these two words look alike.

meaning
0 : Totally different
1 : different
2 : somewhat the same
3 : looks the same
4 : the same or a strong similarity.

So the 1 you got means that the words are not the same.
Why a 1 and not a 0?
Probably because the length of the words are similar.