I don't think so. A table can have only one primary key although it may be constructed using multiple fields.

Cheers

On 21 Jun 2007, at 21:24, first last wrote:

Hi,
A few lines under the heading "Primary key and unique constraints" in the Derby Reference Manual, the documentation says: "A table can have at most one PRIMARY KEY constraint, but can have multiple UNIQUE constraints.".
 
However more than one primary key is allowed on a table I believe?
 
http://db.apache.org/derby/docs/dev/ref/rrefsqlj13590.html