Re: Adding MERGE to the TODO list (resend with subject)

Added to TODO:
* Add MERGE command that does UPDATE, or on failure, INSERT


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Christopher Kings-Lynne wrote:
> >>Except you can keep trying and trying without the outermost transaction 
> >>failing.
> > 
> > But that won't provide the necessary next key locking you mentioned in
> > your first email, will it?
> 
> No, but since I can loop an infinite number of times until either the 
> update or insert works, I don't need next key locking.
> 
> BTW, the reference in MySQL:
> 
> http://dev.mysql.com/doc/mysql/en/REPLACE.html
> 
> Hmm...no refernce to next key locking. Maybe that's an Innodb thing...
> 
> Anyway, you can see how they've implemented their algorithm.
> 
> Here is docs on the DB2 merge command from which the standard was derived:
> 
> http://databasejournal.com/features/db2/article.php/10896_3322041_2
> 
> Chris
> 
> ---------------------------(end of broadcast)---------------------------
> TIP 9: the planner will ignore your desire to choose an index scan if your
>       joining column's datatypes do not match
> 

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