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

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i have sql question on derby database:

select a.name, a.starttime, a.endtime

how can add above sql statement such can difference in hours between start time , end time? (i know mysql there datediff function, not sure function should use derby db)

thanks.

in derby there timestampdiff:

for instance:

select {fn timestampdiff(sql_tsi_frac_second, startdate, enddate)} diff

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