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Unique constraint + upsert

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postgresql_version



1
PostgreSQL 9.6.2, compiled by Visual C++ build 1800, 64-bit





  
c
d



1
1
2





  
c
d



1
1
2



2
1
2000



3
10000
2



4
3
4






    
                		
                
                    

                          
                                
                                
                        
                         



                        
                        
                        

                        

                        
                        

                          
                                
                                
                                  

                                    
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                                      .NET NoSQL database for rapid development