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From:Johan De Meersman Date:January 21 2011 6:22am
Subject:Re: best way to have a unique key
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I have to say, something similar was my first thought, too - you never
mention uuid in your original post. As already stated, uuid() should be a
Universal Unique IDentifier. It's afaik a random 128-bit number; given the
space to choose from it should be rather unique. I have to admit that I'm
not entirely confident about that myself, either, though: as Pratchett put
it, one-in-a-million chances tend to pop up nine times out of ten.

The code should have bits for handling duplicate primaries regardless of the
method used to generate it, tough, so there's no reason to not do it. Having
two subsequent UUID() calls generate pre-existing numbers seems to me to be
likely in the same way as having Bush return his dirty oil dollars to Irak.

On Thu, Jan 20, 2011 at 8:10 PM, Anthony Pace <anthony.pace@stripped>wrote:

> Dude, come on.  I know that all primary keys have to be unique; however, I
> was obviously referring to the use of uuid over auto incrementation.
>
> On 1/20/2011 1:36 PM, Michael Dykman wrote:
>
>> It is axiomatic in the relational model that a primary must be unique.
>>  This is not a quirk put forth by your current employer.  Neither
>> MySQL nor any other RDBMS will allow you to establish a primary key
>> that is not unique.
>>
>>  - michael dykman
>>
>> On Thu, Jan 20, 2011 at 1:32 PM, Anthony Pace<anthony.pace@stripped>
>>  wrote:
>>
>>> Due to certain reasons, the company I am doing business with has decided
>>> that the primary key, for an orders table, be a unique key; however, I
>>> don't
>>> like the possibility of it conflicting if moved to another machine.
>>>
>>> What are some pitfalls of using a unique key, that is generated by a
>>> server
>>> side script, rather than by mysql?
>>> What are the best ways to do this?
>>>
>>> Please keep in mind this variable will also be displayed on the
>>> customer's
>>> Receipt, but again, since it's random, it doesn't have to mean anything.
>>>
>>> --
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>>>
>>>
>>>
>>
>>
>
> --
> MySQL General Mailing List
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>
>


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Thread
best way to have a unique keyAnthony Pace20 Jan
  • Re: best way to have a unique keyKrishna Chandra Prajapati20 Jan
    • Re: best way to have a unique keyAnthony Pace20 Jan
      • Re: best way to have a unique keyLuciano Furtado20 Jan
    • RE: best way to have a unique keyDaevid Vincent20 Jan
Re: best way to have a unique keyAnthony Pace20 Jan
  • Re: best way to have a unique keyAnthony Pace20 Jan
    • Re: best way to have a unique keyMichael Dykman20 Jan
  • Re: best way to have a unique keyJohan De Meersman21 Jan
    • RE: best way to have a unique keyJerry Schwartz21 Jan
      • Re: best way to have a unique keyMichael Satterwhite21 Jan
    • Re: best way to have a unique keyMichael Dykman21 Jan
      • RE: best way to have a unique keyJerry Schwartz21 Jan