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select C.column_name,C.TABLE_NAME from dba_tab_columns C where owner=''
²éÿ¸ö¿ÆÄ¿class ·ÖÊýscroÇ°ÈýÃû
select id, name, class, scro
   from (select row_number() over(partition by class order by scro desc)  cnt,
                id,
                name,
                class,
                scro
           from student) a
  where a.cnt <= 3;
²éÕÒÅÅÐòºóµÄÇ°ÈýÐÐ
  select *
  from (select rw.*, rownum
          from (select *
                  from student d
                 where d.class = 'b'
                 order by d.scro desc) rw
         where rw.id >= 1
         order by rw.class desc) n
where rownum <= 3
±í¸´ÖÆ
insert into table_a (id,name,age) select b.id,b.name,b.age from table_b;
--ɾ³ý±íÊý¾ÝµÄ´¥·¢Æ÷
CREATE OR REPLACE PROCEDURE delete_data
IS
BEGIN
   delete from test ;
   COMMIT;
EXCEPTION
   WHEN NO_DATA_FOUND
   THEN
      NULL;
   WHEN OTHERS
   THEN
      RAISE;
END delete_data;
--¶¨Ê±É¾³ý  ÿ¸ô5·ÖÖÓÖ´ÐÐÒ»´ÎµÄ¼Æ»®
DECLARE
  X NUMBER;
BEGIN
  SYS.DBMS_JOB.SUBMIT
&nbs