MySQL：实现累加求和的功能
1、表结构和表数据idcompany_idstart_timefinish_timewatch_time127032020-08-12 21:51:272020-08-12 21:51:32185227032020-08-12 21:55:212020-08-12 21:55:26640327032020-08-13 13:59:182020-08-13 13:59:22410427032020-08-13 14:07:342020
