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SELECT extract(epoch FROM ts::time) AS seconds_of_day FROM ( VALUES ('2014-10-12 00:00:30'::timestamp) -- 30 , ('2014-10-12 00:01:30') -- 90 , ('2014-10-12 00:02:00') -- 120 , ('2014-10-12 12:00:00') -- 43200 , ('1999-12-23 23:59:59') -- 86399 , ('1999-12-23 23:59:59.123456') -- 86399.123456 ) t(ts);
seconds_of_day
30
90
120
43200
86399
86399.123456
SELECT 6