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select mercado, industria,  count(*)/(select count(*) from balances) as proba from balances where mercado in (select disticnt mercado from balances) and industria in (select distinct industria from balances) group by mercado,industria

    
                		
                
                    

                          
                                
                                
                        
                         



                        
                        
                        

                        

                        
                        

                          
                                
                                
                                  

                                    
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                                      .NET NoSQL database for rapid development