How to convert Time to Decimal in SQL with an integer

Question

I am having a couple of issues converting time to decimal...

Essentially I have used a DATEDIFF to identify the hours and minutes between two dates and times. This produ

Answer 1

Select DATEDIFF(second,  startdate, enddate)/3600.0

Answer 2

Get the time difference in minutes, and divide by 60, this will place hours before the decimal separator and minutes after:

datediff(minute, startdate, enddate) / 60.0

Answer 3

As mentioned in this answer, "Take the DateDiff in seconds instead, and then divide by 86400.0. The decimal point is required."