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How to use many to many relation in SQL

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Execution time: 0,03 sec, rows selected: 6, rows affected: 19, absolute service time: 0,17 sec 
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Calls
Cust
Contract
Serv_Time



1
2
100
ABC
180



2
1
100
EFG
120



3
2
100
NOP
180



4
2
200
HIJ
200



5
1
200
KLM
300



6
1
300
QRS
40






    
                		
                
                    

                          
                                
                                
                        
                         



                        
                        
                        

                        

                        
                        

                          
                                
                                
                                  

                                    
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