How can datediff be used in SqlServer?

In SQL Server, the DATEDIFF function is used to calculate the difference in time between two dates. The basic syntax is as follows:

DATEDIFF(datepart, startdate, enddate)

One of the values that can be specified for the datepart parameter is the unit for calculating the time difference.

1. 年 (nian) – year
2. quarter – a period of three months
3. one month
4. dayofyear (the day number of the year)
5. 日 means day in Japanese.
6. week
7. hour
8. minute – a unit of time equal to 60 seconds
9. One option:
   – The unit of time equal to 1/60th of a minute.
10. tiny fragment of time

The startdate and enddate parameters are the two date or time values being compared.

For example, to calculate the difference in days between two dates, you can use the following statement:

SELECT DATEDIFF(day, '2022-01-01', '2022-01-31')

This will return 31, indicating a 31-day difference between January 1, 2022 and January 31, 2022.