How to find out Primary Key information in the system tables?

- to add further, you can use the following query, it will return the tablename for that Primarykey as the SYSCONSTRAINTS only contain the tableid :

SELECT a.tabname, constrname, d.tabname
  FROM systables a, sysconstraints b, sysreferences c,
       systables d
 WHERE b.constrtype = 'R'
   AND a.tabid = b.tabid
   AND b.constrid = c.constrid
   AND c.ptabid = d.tabid

http://publib.boulder.ibm.com/infocenter/idshelp/v10/index.jsp?topic=/com.ibm.sqlr.doc/sqlrmst47.htm

OP_Zaharin: thanks! It appears that because of the frames on IBM's site, my version of the link went to SYSCOLUMNS and not SYSCONSTRAINTS, so you provide both a wonderful code sample and the correct link. :)

Thank you guys.