I should have read more carefully.. I apologize for my snap response. At a guess: as I recall, under M$ SQLServer the typical (only?) form of unique identifier used is something very UUID-like. MY information might be dated. I was certified as a SQL Server administrator perhaps 12 years agoI would not be terribly surprised to learn that was their motivation. I recall, many years ago, having this same, largely theoretical concern regarding MD5 hashes. Since then experience has taught me that my worries were unfounded. UUID() should be very safe, even for very large datasets.
- michael dykman On Thu, Jan 20, 2011 at 2:20 PM, Anthony Pace <anthony.p...@utoronto.ca> wrote: > Although I did berate you for your obvious cheek, I will of course > complement the acuteness of your response. > > On 1/20/2011 2:10 PM, Anthony Pace 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.p...@utoronto.ca> >>> 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. >>>> >>>> -- >>>> MySQL General Mailing List >>>> For list archives: http://lists.mysql.com/mysql >>>> To unsubscribe: http://lists.mysql.com/mysql?unsub=mdyk...@gmail.com >>>> >>>> >>> >>> >> >> > > > -- > MySQL General Mailing List > For list archives: http://lists.mysql.com/mysql > To unsubscribe: http://lists.mysql.com/mysql?unsub=mdyk...@gmail.com > > -- - michael dykman - mdyk...@gmail.com May the Source be with you. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
