Sql面试题-连续三天登陆_sql 连续三天

题目：获取连续三天登陆的用户

表结构：

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;

表数据：

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'