Re: Hashes from composite keys?
From: Bob Badour <bbadour_at_pei.sympatico.ca>
Date: Mon, 26 Jul 2010 20:03:23 -0300
Message-ID: <4c4e1441$0$11809$9a566e8b_at_news.aliant.net>
Date: Mon, 26 Jul 2010 20:03:23 -0300
Message-ID: <4c4e1441$0$11809$9a566e8b_at_news.aliant.net>
Daniel Pitts wrote:
> On 7/23/2010 1:14 PM, Karsten Wutzke wrote:
>
>> Hello,
>>
>> what are the best practices for generating hash codes from composite
>> keys? I need to mimic something like what a composite index does. In
>> fact, it's for mapping between relational keys and object IDs.
>>
>> Can anyone point me into the right direction please?
>
> Yes, don't use Hashing, but use a composite key. Aggregate the keys into
> one value (eg, the BIT pattern of that one key value is the
> concatination of the bit patterns of all the other values.)
That's rather dumb advice.
<snip> Received on Tue Jul 27 2010 - 01:03:23 CEST