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SQL - Calculate next row based on previous in the same column

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Execution time: 0,02 sec, rows selected: 6, rows affected: 6, absolute service time: 0,16 sec 
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id
a
b



1
1
502,50
33,85



2
2
468,65
25,46



3
3
443,19
20,83



4
4
422,36
133,07



5
5
289,29
144,65



6
6
144,64
144,65






    
                		
                
                    

                          
                                
                                
                        
                         



                        
                        
                        

                        

                        
                        

                          
                                
                                
                                  

                                    
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