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Ejercicio Probabilidad de los valores de un campo - Clase 5

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select idindustria, count(*)/(select count(*) from empresa) as proba fromempresa where idindustria in (select distinct idindustria from empresa) group by idindustria;

    
                		
                
                    

                          
                                
                                
                        
                         



                        
                        
                        

                        

                        
                        

                          
                                
                                
                                  

                                    
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