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      select *
          from User u
         where u.user_name in (select u.user_name 
                                 from User u
                                group by u.user_name   having count(*) > 1)
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  TableA  
  id     customer   PhoneNo  
  001   ÕÅÈý           777777  
  002   ÀîËÄ           444444  
  003   ÍõÎå           555555  
  004   ÕÅÈý           777777  
  005   ÕÅÈý           777777  
  006   ÍõÎå           555555   
  ÈçºÎдһ¸ösqlÓï¾ä½«TableA±ä³ÉÈçÏ   
  001   ÕÅÈý           777777  
  002   ÀîËÄ           444444  
  003   ÍõÎå           555555
--²âÊÔ»·¾³  
  create   table   TableA   (   id   varchar(3),customer   varchar(5),PhoneNo   varchar(6))  
  insert   into   TableA   select   '001','ÕÅÈý','777777'  
  union   all   select   '002','ÀîËÄ','444444'  
  union   all   select   '003','ÍõÎå','555555'  
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oracle sql tuning

alert index mem_ct monitoring usage;
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    TemplateMode NUMBER

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