Oracle Updagte if Exhist else Insert

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merge into A outl

  using (select 1 id, 'A' ran,3 beat from dual) s

  on (outl.ID = s.id and outl.RANG=s.ran )

  when matched then update set BEAT = s.beat

  when not matched then insert (ID, RANG,BEAT) 

  values (s.id, s.ran,s.beat);

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