How do I find the total number of used days in a month?

Question

I am arriving at the total number of days a service has been used in a month. (Start_Date and End_Date are - both inclusive)

Sample Data 1:

User  Sta         


        

Answer 1

As @Pravin Satav addressed, your requirement it's not very clear, something like this is what I understood from your explanation:

SELECT sum(CASE WHEN end_date=start_date THEN 1 ELSE (end_date-start_date)+1 END) as total_days
FROM my_table
WHERE ;