Question

I have table

ID     State        District        StationCode        Status
---------------------------------------------------------------
 1    Gujarat       Banaskantha      12345               0 
 2    Gujarat       Banaskantha      12345               0
 3    M.P.          Bhopal           22315               1
 4    Gujarat       Banaskantha      12349               0
 5    Gujarat       Banaskantha      12345               1

I need result like

State      District       Active       InActive
-----------------------------------------------
Gujarat     Banaskantha      2            1
M.P.        Bhopal           0            1

Here , Active and Inactive fields are sum of Status fields based on 0 or 1

That means here State for Gujarat, There three times 0 occured , but two duplicate rows for StationCode - 12345. It means it will be considered as One.

I have query like below

select distinct 
    state,
    District,
    SUM(
        Case 
        when Status=0 then 1 
        else 0 end
        ) AS Active,
    SUM(
        Case 
            when Status=1 then 1 
            else 0 
        end
        ) AS InActive 
from 
    Station_Master 
group by state, District

But I am unable to count duplicate StationCode row as Single.

How can I do that ?

Answer 1

I think this would probably address your problem.
I am not 100% sure of the syntax but if you can try it out and let me know if it doesnt work, i can try tweak it for you. The idea is to create a derived table using Group By to eliminate the duplicates that you dont want first and then the outer query is same as your original query – just on the derived table instead.

SELECT Distinct 
  X.State, 
  X.District, 
  SUM(Case when X.Status=0 then 1 else 0 end) AS Active,
  SUM(Case when X.Status=1 then 1 else 0 end) AS InActive
FROM 
  (Select State, District, StationCode, Status
   From Station_Master 
   Group By State,District, StationCode, Status) as X
GROUP BY X.State, X.District