三大數據庫時間戳相減得分鍾\秒數

sqlserver時間戳：

日期轉時間戳：SELECT DATEDIFF(S,'2019-05-10 09:49:59.100', GETDATE());
日期轉時間戳：SELECT DATEDIFF(S,'2019-05-12 10:49:59.900', GETDATE());

相減分鍾：SELECT (DATEDIFF(S,'2019-05-10 09:49:59.100', GETDATE())-DATEDIFF(S,'2019-05-12 10:49:59.900', GETDATE()))/60；

相減秒數：SELECT (DATEDIFF(S,'2019-05-10 09:49:59.100', GETDATE())-DATEDIFF(S,'2019-05-12 10:49:59.900', GETDATE()))；

 

myql時間戳相減：

相減分鍾：select timestampdiff(SECOND,'2015-05-04 12:00','2015-05-04 12:01:30')/60;

相減秒數：select timestampdiff(SECOND,'2015-05-04 12:00','2015-05-04 12:01:30');

 

postgresql時間戳相減：

相減分鍾：SELECT (EXTRACT(epoch FROM NOW())-EXTRACT(epoch FROM CAST('2017-12-06 00:17:10' AS TIMESTAMP)))/60;

相減秒數：SELECT EXTRACT(epoch FROM NOW())-EXTRACT(epoch FROM CAST('2017-12-06 00:17:10' AS TIMESTAMP));