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distinct values

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id
b1_name
b2_name



1
1
aaa
b2_aa



2
1
bbb
NULL



3
1
ccc
NULL



4
2
ddd
b2_ba



5
2
eee
b2_bb



6
2
fff
b2_bc



7
2
ggg
NULL



8
2
hhh
NULL






    
                		
                
                    

                          
                                
                                
                        
                         



                        
                        
                        

                        

                        
                        

                          
                                
                                
                                  

                                    
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