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select case when timestamp'2019-01-01 05:00:00' < timestamp'2019-01-01 17:00:00' then timestamp'2019-01-01 05:00:00' - timestamp'2019-01-01 09:00:00' else interval '0' second end as late from dual
LATE
-000000000 04:00:00.000000000
select case when timestamp'2019-01-01 05:00:00' < timestamp'2019-01-01 17:00:00' then extract( hour from timestamp'2019-01-01 05:00:00' - timestamp'2019-01-01 09:00:00' ) else 0 end as late from dual
LATE
-4