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03-09-2021-qwery de frecuencia relativa

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

    
                		
                
                    

                          
                                
                                
                        
                         



                        
                        
                        

                        

                        
                        

                          
                                
                                
                                  

                                    
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                                      .NET NoSQL database for rapid development