On 2/13/2010 11:33 AM, David Morton wrote: > > > > So token was both a primary key, and an index, which is redundant. > > How is that redundant? If you search for only a token, it would not be > indexed, and would perform very poorly.
Because it is the primary key, which is by definition, an index!!! (it is the fastest index too, so any other index on the same column will just be slower (if used at all))
