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From "Bernd Ruehlicke (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-147) ERROR 42X79 not consistant ? - same column name specified twice
Date Tue, 15 Feb 2005 21:33:45 GMT
ERROR 42X79 not consistant ? - same column name specified twice
---------------------------------------------------------------

         Key: DERBY-147
         URL: http://issues.apache.org/jira/browse/DERBY-147
     Project: Derby
        Type: Bug
    Reporter: Bernd Ruehlicke


This happens from JDBC or ij. Here the output form ij>

ij version 10.0 
CONNECTION0* - 	jdbc:derby:phsDB 
* = current connection 
ij> select a1.XXX_foreign, a1.native, a1.kind, a1.XXX_foreign FROM slg_name_lookup a1 ORDER
BY a1.XXX_foreign;
ERROR 42X79: Column name 'XXX_FOREIGN' appears more than once in the result of the query expression.


But when removing the ORDER BY and keeping the 2 same column names it works

ij> select a1.XXX_foreign, a1.native, a1.kind, a1.XXX_foreign FROM slg_name_lookup a1;
XXX_FOREIGN                                                                     |NATIVE  
                                                                       |KIND             
                      |XXX_FOREIGN                                                       
              -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 
0 rows selected 
ij> 


So - it seams to be OK to specify the same column twice - as long as you do not add the ORDER
BY clause.  

I woul dof course like that the system allows this - but at leats it should be consistant
and either allow both or none of the two queries above.



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