How to get the hour difference between 2 datetimestamp on derby db?

问题

I have a sql question on derby database:

Select a.name, a.starttime, a.endtime
From a

How can I add to the above sql statement such that I can get the difference in hours between the start time and end time? (I only know that for mysql there is a DATEDIFF function, but I am not sure about what function should I use for derby db)

Thanks.

回答1:

In Derby there is a TIMESTAMPDIFF:

for instance:

select {fn timestampdiff(SQL_TSI_FRAC_SECOND, startdate, enddate)} as diff 

来源：https://stackoverflow.com/questions/2324522/how-to-get-the-hour-difference-between-2-datetimestamp-on-derby-db