CREATE TABLE `temp_last_3_day` ( uid varchar(25) DEFAULT NULL comment '用户id', dt date DEFAULT NULL comment '日期' ) ENGINE = InnoDB AUTO_INCREMENT = 8 DEFAULT CHARSET = utf8mb4;
INSERT INTO temp_last_3_day (`uid`, `dt`) VALUES ('123', '2021-08-02'); INSERT INTO temp_last_3_day (`uid`, `dt`) VALUES ('123', '2021-08-03'); INSERT INTO temp_last_3_day (`uid`, `dt`) VALUES ('123', '2021-08-04'); INSERT INTO temp_last_3_day (`uid`, `dt`) VALUES ('456', '2021-11-02'); INSERT INTO temp_last_3_day (`uid`, `dt`) VALUES ('456', '2021-12-09'); INSERT INTO temp_last_3_day (`uid`, `dt`) VALUES ('789', '2021-01-01'); INSERT INTO temp_last_3_day (`uid`, `dt`) VALUES ('789', '2021-04-23'); INSERT INTO temp_last_3_day (`uid`, `dt`) VALUES ('789', '2021-09-10'); INSERT INTO temp_last_3_day (`uid`, `dt`) VALUES ('789', '2021-09-12');
对数据进行窗口的排序,用row_number()函数,用日期减排序,如果日期是+1递增的,排序也是+1递增的,减之后的结果应该相同
1,对数据进行窗口排序
2,用函数datesub对日期相减
3,group by uid 求出日期相同的条数大于3的即为结果