palotaiarpad (10/12/2011)
Hmmmm.I used the same source (http://en.wikipedia.org/wiki/Database_normalization) i hope (because the link provided on the result page isn't existing), and there is a definition: A prime attribute, conversely, is an attribute that does occur in any candidate key.
But is it wrong then?
The context here is that Non-Prime attribute does not occur in any candidate key, so CONVERSELY, a PRIME attribute does occur in any [but not all] candidate keys
The statement is correct, however the WIKI definition could certainly be worded a little better...