我怎样才能找到我桌上哪些桌上有外键?

SELECT dc.constraint_name, dc.constraint_type, dc.owner, dc.table_name
FROM dba_cons_columns dcc 
JOIN dba_constraints dc ON (dcc.constraint_name = dc.r_constraint_name and dc.owner = dcc.owner)
WHERE dcc.owner = 'OWNER_NAME' and dcc.table_name = 'TABLE_NAME';

检查 all_constraints 和 all_cons_columns 字典。