我就廢話不多說(shuō)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(bǔ)充：PostgreSQL得出兩個(gè)timestamp的秒數(shù)差值

sql語(yǔ)句

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

86413

計(jì)算兩個(gè)時(shí)間的差值更新另一個(gè)時(shí)間字段

UPDATE your_table

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

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