[sql] Timestamp Difference In Hours for PostgreSQL

The first things popping up

EXTRACT(EPOCH FROM current_timestamp-somedate)/3600

May not be pretty, but unblocks the road. Could be prettier if division of interval by interval was defined.

Edit: if you want it greater than zero either use abs or greatest(...,0). Whichever suits your intention.

Edit++: the reason why I didn't use age is that age with a single argument, to quote the documentation: Subtract from current_date (at midnight). Meaning you don't get an accurate "age" unless running at midnight. Right now it's almost 1am here:

select age(current_timestamp);
       age        
------------------
 -00:52:40.826309
(1 row)

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