I have timestamp in my table and i want to extract only hour from it. I search and find a extract function but unable to use as a query. Do i need to convert first timestamp in varchar and then extract hour from it?
Here is my query:
select extract(hour from timestamp '2001-02-16 20:38:40') // example
select extract(hour from timestamp observationtime) from smartvakt_device_report
The following should work
select extract(hour from observationtime) from smartvakt_device_report