On Mon, Jan 25, 2010 at 10:08 PM, Yong Lee <yong....@gogoants.com> wrote:
> yah, mysql only allows one auto increment field n that's used as the > primary key in tables. I don't think it has to be the primary key as > long as it is a unique key i think that's okay. > > so u should be able to do : create table (myid int unsigned not null > auto_increment....., unique key (myid)); > > but this is effectively a primary key.... > Only mostly true :-) It *is* the same for MyISAM, but for InnoDB the primary key is special, as that is the one that stores the data inline (clustered index). Additional unique keys will only contain a reference to the primary key value for the record. -- Bier met grenadyn Is als mosterd by den wyn Sy die't drinkt, is eene kwezel Hy die't drinkt, is ras een ezel
