oracle中批量修改

BEGIN
  FOR cur IN (
    select t.tagcode as code,t.tagname as names from YJX_SER_PARAME p,yjx_tag t where p.label_code = t.tagcode order by t.tagcode
  ) loop 
 
  update YJX_SER_PARAME set label_name =cur.names where label_code= cur.code;
  
  END loop ;
END ;

-- ----------------------------

UPDATE student s
SET s.name = (
SELECT b.name FROM boy b WHERE s.id = b.id AND s.name != b.name
)
WHERE EXISTS (
SELECT 1 FROM boy b WHERE s.id = b.id AND s.name != b.name
);