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FK error con cadena vacía

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Absolute service time: 0,38 sec, absolute service time: 0,38 sec 
fork mode |  history 
Error(s), warning(s):
Cannot add or update a child row: a foreign key constraint fails (`rextester`.`sstan_hijo`, CONSTRAINT `sstan_hijo_ibfk_1` FOREIGN KEY (`padre_id`) REFERENCES `sstan_padre` (`padre_id`))


        

    
                		
                
                    

                          
                                
                                
                        
                         



                        
                        
                        

                        

                        
                        

                          
                                
                                
                                  

                                    
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                                      .NET NoSQL database for rapid development