Listar todas las FK's de la BD
SELECT CAST(a.tabname AS VARCHAR(15)) AS tabla,
CAST(constrname AS VARCHAR(20)) AS FK,
CAST(d.tabname AS VARCHAR(15)) AS referenciada,
delrule
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