Question

Assume the following situation:

• Week 1:
  • 0 previous cases
  • 10 new cases
  • 3 resolved cases
• Week 2:
  • 7 previous cases
  • 13 new cases
  • 15 resolved cases
• Week 3:
  • 5 previous cases
  • 6 new cases
  • 7 resolved cases

This information is stored in a resumed table of the sort:

RESUME_TABLE:
WEEK    | TOTAL_NEW |   TOTAL_SOLVED
1       |   10      |   3
2       |   13      |   15
3       |   6       |   7

I am having a hard time build a query to obtain the following result:

REPORT_TABLE:
WEEK    |   PREV_TOTAL  |   NEW_CASES   |   SOLVED_CASES    |   NEW_TOTAL
1       |   0           |   10          |   3               |   7
2       |   7           |   13          |   15              |   5
3       |   5           |   6           |   7               |   4

The idea seems pretty trivial, NEW_TOTAL = PREV_TOTAL + NEW_CASES - SOLVED_CASES, though I have been struggling with the idea of carrying the PREV_TOTAL to the next row in order to go on.

I am trying to do it using a view over the RESUME table (Oracle 11g).

Can someone help me with some example code?

Answer 1

Pretty simple and neat with analytic functions:

12:57:06 HR@vm_xe> l                                                                    
  1  select week                                                                        
  2         ,lag(total_cases_by_now - total_solved_by_now) over (order by week) prev_total
  3         ,total_new new_cases                                                        
  4         ,total_solved solved_cases                                                  
  5         ,total_cases_by_now - total_solved_by_now new_total                         
  6    from (                                                                           
  7    select week                                                                      
  8           ,total_new                                                                
  9           ,total_solved                                                             
 10           ,sum(total_new) over(order by week asc) as total_cases_by_now             
 11           ,sum(total_solved) over (order by week asc) as total_solved_by_now        
 12      from resume_table                                                              
 13* )                                                                                  
12:57:07 HR@vm_xe> /                                                                    

      WEEK   PREV_TOTAL  NEW_CASES SOLVED_CASES  NEW_TOTAL                                
---------- ------------ ---------- ------------ ----------                                
         1                      10            3          7                                
         2            7         13           15          5                                
         3            5          6            7          4                                

3 rows selected.                                                                        

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