How to create a Unique constraint on a column that already has duplicates. Only future duplicates should be avoided

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  I have the problem to create a tableview with the same column name, but in the other table.
  
  Table I: -.
  
  Table - PAC051MPROFORMA
  
  Column - MNR, visitid
  
  Table - PAC051TPROFORMA
  Column - MNR, visitid
  
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  Pacviewproforma CREATE VIEW (MNR, visitid)
  
  Like some PAC051MPROFORMA.mrn, PAC051MPROFORMA.visitid, PAC051TPROFORMA.mrn, PAC051TPROFORMA.visitid, PAC052MTRANSBILL.mrn, PAC052MTRANSBILL.visitid
  
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  Hello

  SQL> CREATE VIEW pacviewproforma (mrn,visitid,mrn,visitid,mrn,visitid)
    2  As Select
    3  PAC051MPROFORMA.mrn,
    4  PAC051MPROFORMA.visitid,
    5  PAC051TPROFORMA.mrn,
    6  PAC051TPROFORMA.visitid,
    7  PAC052MTRANSBILL.mrn,
    8  PAC052MTRANSBILL.visitid
    9  from PAC051MPROFORMA,PAC051TPROFORMA,PAC052MTRANSBILL
   10  where
   11  (PAC051MPROFORMA.mrn=PAC051TPROFORMA.mrn)
   12  and
   13  (PAC051TPROFORMA.mrn=PAC052MTRANSBILL.mrn);
  CREATE VIEW pacviewproforma (mrn,visitid,mrn,visitid,mrn,visitid)
                                           *
  ERROR at line 1:
  ORA-00957: duplicate column name
  

  Please give different names to each column.

  Something like that...

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  _visitid,MTRANSBILL_mrn,MTRANSBILL_visitid)
    2  As Select
    3  PAC051MPROFORMA.mrn,
    4  PAC051MPROFORMA.visitid,
    5  PAC051TPROFORMA.mrn,
    6  PAC051TPROFORMA.visitid,
    7  PAC052MTRANSBILL.mrn,
    8  PAC052MTRANSBILL.visitid
    9  from PAC051MPROFORMA,PAC051TPROFORMA,PAC052MTRANSBILL
   10  where
   11  (PAC051MPROFORMA.mrn=PAC051TPROFORMA.mrn)
   12  and
   13  (PAC051TPROFORMA.mrn=PAC052MTRANSBILL.mrn);
  
  View created.
  
  SQL> DESC  pacviewproforma;
   Name                                      Null?    Type
   ----------------------------------------- -------- ----------------------------
   MPROFORMA_MRN                                      NUMBER
   MPROFORMA_VISITID                                  NUMBER
   TPROFORMA_MRN                                      NUMBER
   TPROFORMA_VISITID                                  NUMBER
   MTRANSBILL_MRN                                     NUMBER
   MTRANSBILL_VISITID                                 NUMBER
  

  ORA-01730: number of column names specified invalid

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  Twinkle

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  Rajesh

  Published by: Rajesh on June 10, 2010 15:34

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