On 1/19/07, Garth Keesler <garthk@xxxxxxxxx> wrote:
I have a primary key made up of two varchar(128) columns, typically less than 16 chars each. Concatenating the two columns would still be unique. Would it make sense to concat the two columns, using a unique separator like '~' and index on that single column or would that be more trouble than the potential performance gains?
yes. use a multiple key index. that is what they are for. or let the db do it for you: create table foo (a text, b text, primary key(a,b)); merlin
