On Jul 23, 2004, at 4:57 PM, Kenneth Gonsalves wrote:
On Friday 23 July 2004 12:27 pm, Karsten Hilbert wrote:
BTW, our full schema is here:
http://www.hherb.com/gnumed/schema/
i was looking at your schema. i'm not a database pro, but in master tables i
see you have made the serial id as the primary key. i do it this way:
id serial unique
name varchar(25) not null
primary key is name - after all, you are going to search this on name arent
you? or is there some advantage in doing it your way?
Kenneth,
You appear to be misunderstanding the purpose of a primary key. A primary key is used to ensure there is a way to identify each row uniquely. It is quite independent of which columns you may or may not want to search on. If name is not going to be necessarily unique in the table, it isn't a primary key.
Michael Glaesemann grzm myrealbox com
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