如何從mysql中計算精確值（分鐘）？

Question

我想兩個日期時間數據

it_helpdesk表

request_Date    xetr     CALCULATE_TIME (I want) 
01/01/2017 10:20 AM   01/01/2017 10:40 PM  20 MINUTES 
01/01/2017 10:20 AM   01/01/2017 12:20 AM  120 MINUTES 

我用這個代碼，但得到錯誤的O/P

TIMESTAMPDIFF(MINUTE,Request_Date, Xetr) as WH 

Answer 1

爲什麼不timediff()之間來計算（分鐘）時間time_to_sec()？

select time_to_sec(timediff(Request_Date, Xetr))/60 as WH