我就廢話不多說了，看代碼吧~

select extract(day from t) * 24 + extract(hour from t) from (select (timestamp '2013-12-14 12:00:00' - timestamp '2013-12-11 4:00:00') as t) as a;

例如a表中有start，end倆字段

select extract(day from (end-start)) * 24 + extract(hour from (end-start)) from a

補充：PostgreSQL得出兩個timestamp的秒數(shù)差值

sql語句

SELECT EXTRACT(EPOCH FROM (TIMESTAMP '2017-12-16 12:21:13'- TIMESTAMP '2017-12-15 12:21:00'));

86413

計算兩個時間的差值更新另一個時間字段

UPDATE your_table

SET this_time=(EXTRACT(EPOCH FROM (time_a-time_b)));

以上為個人經(jīng)驗，希望能給大家一個參考，也希望大家多多支持腳本之家。如有錯誤或未考慮完全的地方，望不吝賜教。