PostgreSQL time difference (hours)

SQL is as follows:

SELECT er.create_time,er.update_date,round(cast(date_part('epoch', er.update_date - er.create_time)/60/60 as numeric ),1) as timecha
FROM event_release AS er
WHERE er.create_time >= '2021-3-10 00:00:00'
AND er.create_time <= '2021-3-11 23:59:00'
ORDER BY er.create_time

The results of the operation are shown below:

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