Saurabh Sharma wrote:
>
> hi list,
>
> dbms_utility.get_hash_value converts a string into its hash value..
> how do we get back the original value while selecting the entire
> record.
>
> TIA
>
> Saurabh Sharma
>
> [EMAIL PROTECTED]
> http://www.geocities.com/saurabh00pc/stride.html
You can't. A hash function takes some input and transmogrifies it into
something which hopefully is uniformly spread among a given spectrum. If
h(a) is different from h(b) then a and b are different, but a != b
doesn't imply h(a) != h(b) (if I remember well it means that the
function is not injective. Too many years away and my daughters are too
young for my having refreshed all this ...), which is why you *may* have
collisions and when searching you must still compare against the
non-hashed value. It's a bit like encryption, there is no reverse
function.
--
Regards,
Stephane Faroult
Oriole Corporation
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