Finding difference in two dates in same month in sql using month interval

Question

I am trying to calculate difference in two dates using datediff function and month interval. The problem is that my dates are in the same month so when I calculate difference in months, it's 0. But for my problem, as long as I have the presence of the date, I must count it as 1.

For example:

datediff(month, '2021-01-01', '2021-01-05') 

equals 0, but for my case, I need it to be equal to 1.

Please help!

Answer 1

You could use a CASE statement. For example, the following code works on SQL Server:

select CASE
          WHEN datediff(month,'2021-01-01','2021-01-05') = 0 THEN 1
          ELSE datediff(month,'2021-01-01','2021-01-05')
       END