[PHP-DB] Query error

[Wilmar Perez]

Hello guys

Does anybody have a clue on what wrong with the following sentence?

select author_code from author where author_code not in 
                                (select author_code from authorxcat);

Thanks

*******************************************************
                         Wilmar Pérez
                     Network Administrator
                       Library System
                      Tel: ++57(4)2105145
                    University of Antioquia
                       Medellín - Colombia
                              2002    
*******************************************************                
 
         

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