# 输出列:team_name(表1原字段),region(表1原字段), match_date(表2原字段),opponent(表2原字段),kills(表2原字段),deaths(表2原字段), kda_ratio=kills/deaths(由表2构建计算公式),result(由表2is_win字段改造,赋值1为胜,0为负 CASE WHEN)# 数据源:两张表,连接键team_id,内联结# 分组/窗口:排序选窗口,ROW_NUMBER()OVER(partition by e.time_id order by match_date DESC match_id) AS rk# 过滤条件:...