creation_time,update_time,event_type,value1,value2,null_value,not_used_colum
2021-04-30 12:40:35,,buy,100,109,,1
2021-05-01 12:31:32,,buy,100,200,,1
2021-05-01 12:35:35,,buy,110,205,,1
2021-05-01 12:40:35,,sell,200,209,,1
2021-05-01 12:40:35,2021-05-01 12:40:37,buy,100,109,,1
2021-05-02 12:31:32,,buy,110,200,,1
2021-05-02 12:35:35,,buy,150,205,,1
2021-05-02 12:40:35,,buy,210,209,,1
2021-05-02 12:40:35,,buy,100,109,,1