Hive 中级练习题（40题 待更新）

前言

最近快一周没更了，主要原因是最近在忙另一件事情（关于JavaFX桌面软件开发），眼看大三上一半时间就要过去了，抓紧先学Hive，完了把 Spark 剩下的补了，还有 Kafka、Flume，任务还是不少的，最后再放假前做一个小的大数据项目，希望一切顺利。

环境准备

这部分直接上代码，反正也没人看哈哈哈。

-- SQL 中级
show databases ;

create database practice2;
use practice2;

create table user_info(
    `user_id`  string COMMENT '用户id',
    `gender`   string COMMENT '性别',
    `birthday` string COMMENT '生日'
) COMMENT '用户信息表'
    ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';

insert overwrite table user_info
values ('101', '男', '1990-01-01'),
       ('102', '女', '1991-02-01'),
       ('103', '女', '1992-03-01'),
       ('104', '男', '1993-04-01'),
       ('105', '女', '1994-05-01'),
       ('106', '男', '1995-06-01'),
       ('107', '女', '1996-07-01'),
       ('108', '男', '1997-08-01'),
       ('109', '女', '1998-09-01'),
       ('1010', '男', '1999-10-01');

CREATE TABLE sku_info(
    `sku_id`      string COMMENT '商品id',
    `name`        string COMMENT '商品名称',
    `category_id` string COMMENT '所属分类id',
    `from_date`   string COMMENT '上架日期',
    `price`       double COMMENT '商品单价'
) COMMENT '商品属性表'
    ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';

insert overwrite table sku_info
values ('1', 'xiaomi 10', '1', '2020-01-01', 2000),
       ('2', '手机壳', '1', '2020-02-01', 10),
       ('3', 'apple 12', '1', '2020-03-01', 5000),
       ('4', 'xiaomi 13', '1', '2020-04-01', 6000),
       ('5', '破壁机', '2', '2020-01-01', 500),
       ('6', '洗碗机', '2', '2020-02-01', 2000),
       ('7', '热水壶', '2', '2020-03-01', 100),
       ('8', '微波炉', '2', '2020-04-01', 600),
       ('9', '自行车', '3', '2020-01-01', 1000),
       ('10', '帐篷', '3', '2020-02-01', 100),
       ('11', '烧烤架', '3', '2020-02-01', 50),
       ('12', '遮阳伞', '3', '2020-03-01', 20);

create table category_info(
    `category_id`   string,
    `category_name` string
) COMMENT '品类表'
    ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';

insert overwrite table category_info
values ('1','数码'),
       ('2','厨卫'),
       ('3','户外');

create table order_info(
    `order_id`     string COMMENT '订单id',
    `user_id`      string COMMENT '用户id',
    `create_date`  string COMMENT '下单日期',
    `total_amount` decimal(16, 2) COMMENT '订单总金额'
) COMMENT '订单表'
    ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';

insert overwrite table order_info
values ('1', '101', '2021-09-27', 29000.00),
       ('2', '101', '2021-09-28', 70500.00),
       ('3', '101', '2021-09-29', 43300.00),
       ('4', '101', '2021-09-30', 860.00),
       ('5', '102', '2021-10-01', 46180.00),
       ('6', '102', '2021-10-01', 50000.00),
       ('7', '102', '2021-10-01', 75500.00),
       ('8', '102', '2021-10-02', 6170.00),
       ('9', '103', '2021-10-02', 18580.00),
       ('10', '103', '2021-10-02', 28000.00),
       ('11', '103', '2021-10-02', 23400.00),
       ('12', '103', '2021-10-03', 5910.00),
       ('13', '104', '2021-10-03', 13000.00),
       ('14', '104', '2021-10-03', 69500.00),
       ('15', '104', '2021-10-03', 2000.00),
       ('16', '104', '2021-10-03', 5380.00),
       ('17', '105', '2021-10-04', 6210.00),
       ('18', '105', '2021-10-04', 68000.00),
       ('19', '105', '2021-10-04', 43100.00),
       ('20', '105', '2021-10-04', 2790.00),
       ('21', '106', '2021-10-04', 9390.00),
       ('22', '106', '2021-10-05', 58000.00),
       ('23', '106', '2021-10-05', 46600.00),
       ('24', '106', '2021-10-05', 5160.00),
       ('25', '107', '2021-10-05', 55350.00),
       ('26', '107', '2021-10-05', 14500.00),
       ('27', '107', '2021-10-06', 47400.00),
       ('28', '107', '2021-10-06', 6900.00),
       ('29', '108', '2021-10-06', 56570.00),
       ('30', '108', '2021-10-06', 44500.00),
       ('31', '108', '2021-10-07', 50800.00),
       ('32', '108', '2021-10-07', 3900.00),
       ('33', '109', '2021-10-07', 41480.00),
       ('34', '109', '2021-10-07', 88000.00),
       ('35', '109', '2020-10-08', 15000.00),
       ('36', '109', '2020-10-08', 9020.00),
       ('37', '1010', '2020-10-08', 9260.00),
       ('38', '1010', '2020-10-08', 12000.00),
       ('39', '1010', '2020-10-08', 23900.00),
       ('40', '1010', '2020-10-08', 6790.00);

CREATE TABLE order_detail
(
    `order_detail_id` string COMMENT '订单明细id',
    `order_id`        string COMMENT '订单id',
    `sku_id`          string COMMENT '商品id',
    `create_date`     string COMMENT '下单日期',
    `price`           decimal(16, 2) COMMENT '下单时的商品单价',
    `sku_num`         int COMMENT '下单商品件数'
) COMMENT '订单明细表'
    ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';

INSERT overwrite table order_detail
values ('1', '1', '1', '2021-09-27', 2000.00, 2),
       ('2', '1', '3', '2021-09-27', 5000.00, 5),
       ('3', '2', '4', '2021-09-28', 6000.00, 9),
       ('4', '2', '5', '2021-09-28', 500.00, 33),
       ('5', '3', '7', '2021-09-29', 100.00, 37),
       ('6', '3', '8', '2021-09-29', 600.00, 46),
       ('7', '3', '9', '2021-09-29', 1000.00, 12),
       ('8', '4', '12', '2021-09-30', 20.00, 43),
       ('9', '5', '1', '2021-10-01', 2000.00, 8),
       ('10', '5', '2', '2021-10-01', 10.00, 18),
       ('11', '5', '3', '2021-10-01', 5000.00, 6),
       ('12', '6', '4', '2021-10-01', 6000.00, 8),
       ('13', '6', '6', '2021-10-01', 2000.00, 1),
       ('14', '7', '7', '2021-10-01', 100.00, 17),
       ('15', '7', '8', '2021-10-01', 600.00, 48),
       ('16', '7', '9', '2021-10-01', 1000.00, 45),
       ('17', '8', '10', '2021-10-02', 100.00, 48),
       ('18', '8', '11', '2021-10-02', 50.00, 15),
       ('19', '8', '12', '2021-10-02', 20.00, 31),
       ('20', '9', '1', '2021-09-30', 2000.00, 9),
       ('21', '9', '2', '2021-10-02', 10.00, 5800),
       ('22', '10', '4', '2021-10-02', 6000.00, 1),
       ('23', '10', '5', '2021-10-02', 500.00, 24),
       ('24', '10', '6', '2021-10-02', 2000.00, 5),
       ('25', '11', '8', '2021-10-02', 600.00, 39),
       ('26', '12', '10', '2021-10-03', 100.00, 47),
       ('27', '12', '11', '2021-10-03', 50.00, 19),
       ('28', '12', '12', '2021-10-03', 20.00, 13000),
       ('29', '13', '1', '2021-10-03', 2000.00, 4),
       ('30', '13', '3', '2021-10-03', 5000.00, 1),
       ('31', '14', '4', '2021-10-03', 6000.00, 5),
       ('32', '14', '5', '2021-10-03', 500.00, 47),
       ('33', '14', '6', '2021-10-03', 2000.00, 8),
       ('34', '15', '7', '2021-10-03', 100.00, 20),
       ('35', '16', '10', '2021-10-03', 100.00, 22),
       ('36', '16', '11', '2021-10-03', 50.00, 42),
       ('37', '16', '12', '2021-10-03', 20.00, 7400),
       ('38', '17', '1', '2021-10-04', 2000.00, 3),
       ('39', '17', '2', '2021-10-04', 10.00, 21),
       ('40', '18', '4', '2021-10-04', 6000.00, 8),
       ('41', '18', '5', '2021-10-04', 500.00, 28),
       ('42', '18', '6', '2021-10-04', 2000.00, 3),
       ('43', '19', '7', '2021-10-04', 100.00, 55),
       ('44', '19', '8', '2021-10-04', 600.00, 11),
       ('45', '19', '9', '2021-10-04', 1000.00, 31),
       ('46', '20', '11', '2021-10-04', 50.00, 45),
       ('47', '20', '12', '2021-10-04', 20.00, 27),
       ('48', '21', '1', '2021-10-04', 2000.00, 2),
       ('49', '21', '2', '2021-10-04', 10.00, 39),
       ('50', '21', '3', '2021-10-04', 5000.00, 1),
       ('51', '22', '4', '2021-10-05', 6000.00, 8),
       ('52', '22', '5', '2021-10-05', 500.00, 20),
       ('53', '23', '7', '2021-10-05', 100.00, 58),
       ('54', '23', '8', '2021-10-05', 600.00, 18),
       ('55', '23', '9', '2021-10-05', 1000.00, 30),
       ('56', '24', '10', '2021-10-05', 100.00, 27),
       ('57', '24', '11', '2021-10-05', 50.00, 28),
       ('58', '24', '12', '2021-10-05', 20.00, 53),
       ('59', '25', '1', '2021-10-05', 2000.00, 5),
       ('60', '25', '2', '2021-10-05', 10.00, 35),
       ('61', '25', '3', '2021-10-05', 5000.00, 9),
       ('62', '26', '4', '2021-10-05', 6000.00, 1),
       ('63', '26', '5', '2021-10-05', 500.00, 13),
       ('64', '26', '6', '2021-10-05', 2000.00, 1),
       ('65', '27', '7', '2021-10-06', 100.00, 30),
       ('66', '27', '8', '2021-10-06', 600.00, 19),
       ('67', '27', '9', '2021-10-06', 1000.00, 33),
       ('68', '28', '10', '2021-10-06', 100.00, 37),
       ('69', '28', '11', '2021-10-06', 50.00, 46),
       ('70', '28', '12', '2021-10-06', 20.00, 45),
       ('71', '29', '1', '2021-10-06', 2000.00, 8),
       ('72', '29', '2', '2021-10-06', 10.00, 57),
       ('73', '29', '3', '2021-10-06', 5000.00, 8),
       ('74', '30', '4', '2021-10-06', 6000.00, 3),
       ('75', '30', '5', '2021-10-06', 500.00, 33),
       ('76', '30', '6', '2021-10-06', 2000.00, 5),
       ('77', '31', '8', '2021-10-07', 600.00, 13),
       ('78', '31', '9', '2021-10-07', 1000.00, 43),
       ('79', '32', '10', '2021-10-07', 100.00, 24),
       ('80', '32', '11', '2021-10-07', 50.00, 30),
       ('81', '33', '1', '2021-10-07', 2000.00, 8),
       ('82', '33', '2', '2021-10-07', 10.00, 48),
       ('83', '33', '3', '2021-10-07', 5000.00, 5),
       ('84', '34', '4', '2021-10-07', 6000.00, 10),
       ('85', '34', '5', '2021-10-07', 500.00, 44),
       ('86', '34', '6', '2021-10-07', 2000.00, 3),
       ('87', '35', '8', '2020-10-08', 600.00, 25),
       ('88', '36', '10', '2020-10-08', 100.00, 57),
       ('89', '36', '11', '2020-10-08', 50.00, 44),
       ('90', '36', '12', '2020-10-08', 20.00, 56),
       ('91', '37', '1', '2020-10-08', 2000.00, 2),
       ('92', '37', '2', '2020-10-08', 10.00, 26),
       ('93', '37', '3', '2020-10-08', 5000.00, 1),
       ('94', '38', '6', '2020-10-08', 2000.00, 6),
       ('95', '39', '7', '2020-10-08', 100.00, 35),
       ('96', '39', '8', '2020-10-08', 600.00, 34),
       ('97', '40', '10', '2020-10-08', 100.00, 37),
       ('98', '40', '11', '2020-10-08', 50.00, 51),
       ('99', '40', '12', '2020-10-08', 20.00, 27);

CREATE TABLE user_login_detail
(
    `user_id`    string comment '用户id',
    `ip_address` string comment 'ip地址',
    `login_ts`   string comment '登录时间',
    `logout_ts`  string comment '登出时间'
) COMMENT '用户登录明细表'
    ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';

INSERT overwrite table user_login_detail
VALUES ('101', '180.149.130.161', '2021-09-21 08:00:00', '2021-09-27 08:30:00'),
       ('101', '180.149.130.161', '2021-09-27 08:00:00', '2021-09-27 08:30:00'),
       ('101', '180.149.130.161', '2021-09-28 09:00:00', '2021-09-28 09:10:00'),
       ('101', '180.149.130.161', '2021-09-29 13:30:00', '2021-09-29 13:50:00'),
       ('101', '180.149.130.161', '2021-09-30 20:00:00', '2021-09-30 20:10:00'),
       ('102', '120.245.11.2', '2021-09-22 09:00:00', '2021-09-27 09:30:00'),
       ('102', '120.245.11.2', '2021-10-01 08:00:00', '2021-10-01 08:30:00'),
       ('102', '180.149.130.174', '2021-10-01 07:50:00', '2021-10-01 08:20:00'),
       ('102', '120.245.11.2', '2021-10-02 08:00:00', '2021-10-02 08:30:00'),
       ('103', '27.184.97.3', '2021-09-23 10:00:00', '2021-09-27 10:30:00'),
       ('103', '27.184.97.3', '2021-10-03 07:50:00', '2021-10-03 09:20:00'),
       ('104', '27.184.97.34', '2021-09-24 11:00:00', '2021-09-27 11:30:00'),
       ('104', '27.184.97.34', '2021-10-03 07:50:00', '2021-10-03 08:20:00'),
       ('104', '27.184.97.34', '2021-10-03 08:50:00', '2021-10-03 10:20:00'),
       ('104', '120.245.11.89', '2021-10-03 08:40:00', '2021-10-03 10:30:00'),
       ('105', '119.180.192.212', '2021-10-04 09:10:00', '2021-10-04 09:30:00'),
       ('106', '119.180.192.66', '2021-10-04 08:40:00', '2021-10-04 10:30:00'),
       ('106', '119.180.192.66', '2021-10-05 21:50:00', '2021-10-05 22:40:00'),
       ('107', '219.134.104.7', '2021-09-25 12:00:00', '2021-09-27 12:30:00'),
       ('107', '219.134.104.7', '2021-10-05 22:00:00', '2021-10-05 23:00:00'),
       ('107', '219.134.104.7', '2021-10-06 09:10:00', '2021-10-06 10:20:00'),
       ('107', '27.184.97.46', '2021-10-06 09:00:00', '2021-10-06 10:00:00'),
       ('108', '101.227.131.22', '2021-10-06 09:00:00', '2021-10-06 10:00:00'),
       ('108', '101.227.131.22', '2021-10-06 22:00:00', '2021-10-06 23:00:00'),
       ('109', '101.227.131.29', '2021-09-26 13:00:00', '2021-09-27 13:30:00'),
       ('109', '101.227.131.29', '2021-10-06 08:50:00', '2021-10-06 10:20:00'),
       ('109', '101.227.131.29', '2021-10-08 09:00:00', '2021-10-08 09:10:00'),
       ('1010', '119.180.192.10', '2021-09-27 14:00:00', '2021-09-27 14:30:00'),
       ('1010', '119.180.192.10', '2021-10-09 08:50:00', '2021-10-09 10:20:00');

CREATE TABLE sku_price_modify_detail
(
    `sku_id`      string comment '商品id',
    `new_price`   decimal(16, 2) comment '更改后的价格',
    `change_date` string comment '变动日期'
) COMMENT '商品价格变更明细表'
    ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';

insert overwrite table sku_price_modify_detail
values ('1', 1900, '2021-09-25'),
       ('1', 2000, '2021-09-26'),
       ('2', 80, '2021-09-29'),
       ('2', 10, '2021-09-30'),
       ('3', 4999, '2021-09-25'),
       ('3', 5000, '2021-09-26'),
       ('4', 5600, '2021-09-26'),
       ('4', 6000, '2021-09-27'),
       ('5', 490, '2021-09-27'),
       ('5', 500, '2021-09-28'),
       ('6', 1988, '2021-09-30'),
       ('6', 2000, '2021-10-01'),
       ('7', 88, '2021-09-28'),
       ('7', 100, '2021-09-29'),
       ('8', 800, '2021-09-28'),
       ('8', 600, '2021-09-29'),
       ('9', 1100, '2021-09-27'),
       ('9', 1000, '2021-09-28'),
       ('10', 90, '2021-10-01'),
       ('10', 100, '2021-10-02'),
       ('11', 66, '2021-10-01'),
       ('11', 50, '2021-10-02'),
       ('12', 35, '2021-09-28'),
       ('12', 20, '2021-09-29');

CREATE TABLE delivery_info
(
    `delivery_id` string comment '配送单id',
    `order_id`    string comment '订单id',
    `user_id`     string comment '用户id',
    `order_date`  string comment '下单日期',
    `custom_date` string comment '期望配送日期'
) COMMENT '邮寄信息表'
    ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';

insert overwrite table delivery_info
values ('1', '1', '101', '2021-09-27', '2021-09-29'),
       ('2', '2', '101', '2021-09-28', '2021-09-28'),
       ('3', '3', '101', '2021-09-29', '2021-09-30'),
       ('4', '4', '101', '2021-09-30', '2021-10-01'),
       ('5', '5', '102', '2021-10-01', '2021-10-01'),
       ('6', '6', '102', '2021-10-01', '2021-10-01'),
       ('7', '7', '102', '2021-10-01', '2021-10-03'),
       ('8', '8', '102', '2021-10-02', '2021-10-02'),
       ('9', '9', '103', '2021-10-02', '2021-10-03'),
       ('10', '10', '103', '2021-10-02', '2021-10-04'),
       ('11', '11', '103', '2021-10-02', '2021-10-02'),
       ('12', '12', '103', '2021-10-03', '2021-10-03'),
       ('13', '13', '104', '2021-10-03', '2021-10-04'),
       ('14', '14', '104', '2021-10-03', '2021-10-04'),
       ('15', '15', '104', '2021-10-03', '2021-10-03'),
       ('16', '16', '104', '2021-10-03', '2021-10-03'),
       ('17', '17', '105', '2021-10-04', '2021-10-04'),
       ('18', '18', '105', '2021-10-04', '2021-10-06'),
       ('19', '19', '105', '2021-10-04', '2021-10-06'),
       ('20', '20', '105', '2021-10-04', '2021-10-04'),
       ('21', '21', '106', '2021-10-04', '2021-10-04'),
       ('22', '22', '106', '2021-10-05', '2021-10-05'),
       ('23', '23', '106', '2021-10-05', '2021-10-05'),
       ('24', '24', '106', '2021-10-05', '2021-10-07'),
       ('25', '25', '107', '2021-10-05', '2021-10-05'),
       ('26', '26', '107', '2021-10-05', '2021-10-06'),
       ('27', '27', '107', '2021-10-06', '2021-10-06'),
       ('28', '28', '107', '2021-10-06', '2021-10-07'),
       ('29', '29', '108', '2021-10-06', '2021-10-06'),
       ('30', '30', '108', '2021-10-06', '2021-10-06'),
       ('31', '31', '108', '2021-10-07', '2021-10-09'),
       ('32', '32', '108', '2021-10-07', '2021-10-09'),
       ('33', '33', '109', '2021-10-07', '2021-10-08'),
       ('34', '34', '109', '2021-10-07', '2021-10-08'),
       ('35', '35', '109', '2021-10-08', '2021-10-10'),
       ('36', '36', '109', '2021-10-08', '2021-10-09'),
       ('37', '37', '1010', '2021-10-08', '2021-10-10'),
       ('38', '38', '1010', '2021-10-08', '2021-10-10'),
       ('39', '39', '1010', '2021-10-08', '2021-10-09'),
       ('40', '40', '1010', '2021-10-08', '2021-10-09');

CREATE TABLE friendship_info(
    `user1_id` string comment '用户1id',
    `user2_id` string comment '用户2id'
) COMMENT '用户关系表'
    ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';

insert overwrite table friendship_info
values ('101', '1010'),
       ('101', '108'),
       ('101', '106'),
       ('101', '104'),
       ('101', '102'),
       ('102', '1010'),
       ('102', '108'),
       ('102', '106'),
       ('102', '104'),
       ('102', '102'),
       ('103', '1010'),
       ('103', '108'),
       ('103', '106'),
       ('103', '104'),
       ('103', '102'),
       ('104', '1010'),
       ('104', '108'),
       ('104', '106'),
       ('104', '104'),
       ('104', '102'),
       ('105', '1010'),
       ('105', '108'),
       ('105', '106'),
       ('105', '104'),
       ('105', '102'),
       ('106', '1010'),
       ('106', '108'),
       ('106', '106'),
       ('106', '104'),
       ('106', '102'),
       ('107', '1010'),
       ('107', '108'),
       ('107', '106'),
       ('107', '104'),
       ('107', '102'),
       ('108', '1010'),
       ('108', '108'),
       ('108', '106'),
       ('108', '104'),
       ('108', '102'),
       ('109', '1010'),
       ('109', '108'),
       ('109', '106'),
       ('109', '104'),
       ('109', '102'),
       ('1010', '1010'),
       ('1010', '108'),
       ('1010', '106'),
       ('1010', '104'),
       ('1010', '102');

CREATE TABLE favor_info
(
    `user_id`     string comment '用户id',
    `sku_id`      string comment '商品id',
    `create_date` string comment '收藏日期'
) COMMENT '用户收藏表'
    ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';

insert overwrite table favor_info
values ('101', '3', '2021-09-23'),
       ('101', '12', '2021-09-23'),
       ('101', '6', '2021-09-25'),
       ('101', '10', '2021-09-21'),
       ('101', '5', '2021-09-25'),
       ('102', '1', '2021-09-24'),
       ('102', '2', '2021-09-24'),
       ('102', '8', '2021-09-23'),
       ('102', '12', '2021-09-22'),
       ('102', '11', '2021-09-23'),
       ('102', '9', '2021-09-25'),
       ('102', '4', '2021-09-25'),
       ('102', '6', '2021-09-23'),
       ('102', '7', '2021-09-26'),
       ('103', '8', '2021-09-24'),
       ('103', '5', '2021-09-25'),
       ('103', '6', '2021-09-26'),
       ('103', '12', '2021-09-27'),
       ('103', '7', '2021-09-25'),
       ('103', '10', '2021-09-25'),
       ('103', '4', '2021-09-24'),
       ('103', '11', '2021-09-25'),
       ('103', '3', '2021-09-27'),
       ('104', '9', '2021-09-28'),
       ('104', '7', '2021-09-28'),
       ('104', '8', '2021-09-25'),
       ('104', '3', '2021-09-28'),
       ('104', '11', '2021-09-25'),
       ('104', '6', '2021-09-25'),
       ('104', '12', '2021-09-28'),
       ('105', '8', '2021-10-08'),
       ('105', '9', '2021-10-07'),
       ('105', '7', '2021-10-07'),
       ('105', '11', '2021-10-06'),
       ('105', '5', '2021-10-07'),
       ('105', '4', '2021-10-05'),
       ('105', '10', '2021-10-07'),
       ('106', '12', '2021-10-08'),
       ('106', '1', '2021-10-08'),
       ('106', '4', '2021-10-04'),
       ('106', '5', '2021-10-08'),
       ('106', '2', '2021-10-04'),
       ('106', '6', '2021-10-04'),
       ('106', '7', '2021-10-08'),
       ('107', '5', '2021-09-29'),
       ('107', '3', '2021-09-28'),
       ('107', '10', '2021-09-27'),
       ('108', '9', '2021-10-08'),
       ('108', '3', '2021-10-10'),
       ('108', '8', '2021-10-10'),
       ('108', '10', '2021-10-07'),
       ('108', '11', '2021-10-07'),
       ('109', '2', '2021-09-27'),
       ('109', '4', '2021-09-29'),
       ('109', '5', '2021-09-29'),
       ('109', '9', '2021-09-30'),
       ('109', '8', '2021-09-26'),
       ('1010', '2', '2021-09-29'),
       ('1010', '9', '2021-09-29'),
       ('1010', '1', '2021-10-01');

题目

1、查询累积销量排名第二的商品

题目需求

查询订单明细表（order_detail）中销量（下单件数）排名第二的商品id，如果不存在返回null，如果存在多个排名第二的商品则需要全部返回。

代码

这里使用了窗口函数中的排名函数-dense_rank() ，对于相同值的数据，它的排名是相同的，比如100,100,200，它的排名就是 1,1,2，默认是降序的，这里我们需要设置为升序排列。

这里不需要分区。

对于不同订单，它可能会有相同的商品，所以我们需要用一个聚合函数sum来实现。

select sku_id from (
    select sku_id,
           order_num,
           dense_rank() over (order by order_num desc) rank
    from (
        select sku_id,
               sum(sku_num) order_num
            from order_detail
            group by sku_id
            )t1
        )
where rank=2;

2、查询至少连续三天下单的用户

题目需求

查询订单信息表(order_info)中最少连续3天下单的用户id。

代码

1. 找到每个用户的下单日期（需要去重）

-- 找到用户的下单日期-需要去重(一天下单多次)
select distinct user_id,
                create_date
from order_info;

-- 第二种去重方式
select user_id, 
       create_date
from order_info
group by user_id,create_date;    --group by 就是把相同的字段值放到一起

--第三种去重方式
select user_id,create_date
from(
select user_id,
       create_date,
       row_number() over (partition by user_id,create_date) rn
from order_info
    )t1
where rn=1;

查看SQL语句执行计划

explain select distinct user_id,
                create_date
from order_info;

2.查看连续三天下单的用户

思路：

user_id      create_date      lead(create_date,2,'9999-12-31')      datadiff
1001          2023-06-01            2023-06-03                      2
1001          2023-06-02            2023-06-06                      4
1001          2023-06-03            2023-06-07                      4
1001          2023-06-06            2023-06-08                      2
1001          2023-06-07            9999-12-31                      2913****
1001          2023-06-08            9999-12-31                      2913****

代码 

select distinct user_id
from(
    select user_id,
       datediff(create_date,lead2) diff
    from(
        select user_id,
               create_date,
               lead(create_date,2,'9999-12-31') over (partition by user_id order by create_date) lead2
               from
        (
        select distinct user_id,
                        create_date
        from order_info)t1
        )t2
    )t3
where diff=2;

思路2

user_id      create_date      rank()    diff        
1001          2023-06-02      1         2023-06-01
1001          2023-06-03      2         2023-06-01
1001          2023-06-04      3         2023-06-01
1001          2023-06-06      4         2023-06-02
1001          2023-06-07      5         2023-06-02
1001          2023-06-08      6         2023-06-02

select distinct user_id
from(
    select user_id,
       diff,
       count(*) cnt
    from (
        select user_id,
                       create_date,
                       date_sub(create_date, rank() over (partition by user_id order by create_date)) diff
                from (
                         select distinct user_id,
                                         create_date
                         from order_info
                     ) t1
            )t2
group by user_id,diff
having cnt
        )t3;

思路3

user_id      create_date      count() over(partition by user_id order by create_date range between 86400 preceding and 86400 following )
1001          2023-06-02            2
1001          2023-06-03            3
1001          2023-06-04            2
1001          2023-06-06            2
1001          2023-06-07            3
1001          2023-06-08            2

select distinct user_id
from (
         select user_id,
                ts,
                count(*) over (partition by user_id order by ts range between 86400 preceding and 86400 following) cnt
         from (
                  select user_id,
                         unix_timestamp(create_date, 'yyyy-MM-dd') ts
                  from (
                           select distinct user_id,
                                           create_date
                           from order_info
                       ) t1
              ) t2
     )t3
where cnt=3;