如何負時差值設置爲零

Question

如果時間差結果是否定的我如何將其設置爲零

select TIMEDIFF('2016-01-29 12:28:18','2016-01-29 19:27:51') as diff; 

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| -06：59：33 |

Answer 1

嘗試這種情況：

select if((time_to_sec(TIMEDIFF('2016-01-29 12:28:18','2016-01-29 19:27:51'))/3600) < 0,0,TIMEDIFF('2016-01-29 12:28:18','2016-01-29 19:27:51')) as diff;