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一、MySql时间戳转换

select unix_timestamp();  #获取时间戳格式时间
select FROM_UNIXTIME(1717399499); #将时间戳转换为普通格式时间

二、Mysql时间相加减结果转换为秒

方法1：time_to_sec(timediff(endTime, startTime))

SELECTDISTINCT(column1),min(last_modified_time),max(last_modified_time),time_to_sec(timediff(max(last_modified_time), min(last_modified_time))) as time1
FROMtable1
wherecolumn1 = 'aaa';

方法2：timestampdiff(second, startTime, endTime)

SELECTDISTINCT(column1),min(last_modified_time),max(last_modified_time),timestampdiff(second,min(last_modified_time),max(last_modified_time)) as time2
FROMtable1
wherecolumn1 = 'aaa';

方法3：unix_timestamp(endTime) -unix_timestamp(startTime)

SELECTDISTINCT(column1),min(last_modified_time),max(last_modified_time),unix_timestamp(max(last_modified_time)) - unix_timestamp(min(last_modified_time)) as time3
FROMtable1
wherecolumn1 = 'aaa';

三、Mysql时间相加减结果为时分秒

方法：timediff(time1,time2)

SELECTcolumn1,max(last_modified_time),min(last_modified_time),timediff(max(last_modified_time),min(last_modified_time))
FROMtable1
wherecolumn1 = 'aaa';