oracle sql

DELETE FROM  CIMAPINIWORKSTATION WHERE APID='MAB001' AND WORKSTATION='CQ';
INSERT  INTO CIMAPINIWORKSTATION SELECT  APID,'QQ',SECTION,ITEM,VALUE FROM
CIMAPINIWORKSTATION WHERE APID='MAB001' AND WORKSTATION='TESTFA';

 

select  rownum, messageid   from   table where   rownum<=20  
  minus    
  select  rownum,   messageid from   table where   rownum<=10