Returns the timestamp of series as their values. By itself this is not very useful but it might be combined with another aggregation function to get a specific result.
SiriDB has function interval() for the common combination timeval() => difference()
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timeval()
None
The returned series will contain points where each point will have a value equal to the timestamp.
# Select the timestamps as values from 'series-001'
select timeval() from 'series-001'