postgresql计算时间差

日期之差

  --**获取秒差**
SELECT round(date_part('epoch', TIMESTAMP '2019-05-05 12:11:20' - TIMESTAMP '2019-05-05 10:10:10'));

  --**获取分钟差**
SELECT round(date_part('epoch', TIMESTAMP '2019-05-05 12:11:20' - TIMESTAMP '2019-05-05 10:10:10')/60);

  --**获取小时差**
SELECT round(date_part('epoch', TIMESTAMP '2019-05-05 12:11:20' - TIMESTAMP '2019-05-05 10:10:10')/60/60);

  --**获取天数差**
SELECT Date('2019-06-05') - Date('2019-05-03');
  --**获取月份差**
select extract(year from age(TIMESTAMP '2018-04-05',TIMESTAMP '2017-02-04')) * 12  + extract(MONTH from age(TIMESTAMP '2019-04-05',TIMESTAMP '2017-02-04'));
  --**获取年份差**
SELECT extract(year from age(TIMESTAMP '2018-04-05',TIMESTAMP '2017-02-04'));