可以参考查询库中的所有外键
SELECT CON_OBJ.NAME FK_NAME,
CON_OBJ.ID,
CONS.VALID,
OBJTAB.NAME TABLE_NAME,
OBJSCH.NAME SCH_NAME,
CONS.FINDEXID
FROM SYSCONS CONS,
SYSOBJECTS CON_OBJ,
SYSOBJECTS OBJSCH,
SYSOBJECTS OBJTAB
WHERE CONS.ID=CON_OBJ.ID
AND CONS.TABLEID=OBJTAB.ID
AND OBJTAB.SCHID=OBJSCH.ID
AND CONS.TYPE$='F';