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mysql - MySQL - 选择所有房间，包括部分日期范围

问题描述

我目前有可用的房间，它显示给定日期范围的当前开放房间预订。

我需要显示相同的可用性，但我需要显示部分可用性，而不是显示完全可用性的房间。

Eg: booking 1 is from dates 22nd to 25th (within room 4)
booking 2 is from dates 24th to 28th (within room 3)
queried booking is from 23rd till 25th

22nd    23rd  24th     25th      28th
|-----------------------|
               |------------------|
        |------|                    free space

询问：

SELECT r.*
     , CASE WHEN b.ref IS NULL THEN 'all' ELSE 'partial' END status
  FROM roominfo r 
  LEFT JOIN bookroom br ON br.id = r.id 
  LEFT JOIN book b ON b.ref = br.ref 
  AND b.end_date >= '2019-11-23' AND b.start_date <= '2019-11-25'
 ORDERBY r.id;

示例结构和数据：

 CREATE SCHEMA TEST;
USE TEST;

CREATE TABLE BOOK( Ref INT NOT NULL AUTO_INCREMENT, Start_Date DATE NOT NULL, End_Date DATE NOT NULL, PRIMARY KEY(Ref));
CREATE TABLE ROOMINFO( ID INT NOT NULL AUTO_INCREMENT, `Type` VARCHAR(10) NOT NULL, Max TINYINT NOT NULL, PRIMARY KEY(ID));
CREATE TABLE BOOKROOM( Ref INT NOT NULL,ID INT NOT NULL, FOREIGN KEY (Ref) REFERENCES BOOK(Ref), FOREIGN KEY (ID) REFERENCES ROOMINFO(ID));

INSERT INTO BOOK(Start_Date, End_Date) VALUES   
('2019-11-22', '2019-11-25'),('2019-11-24', '2019-11-28'),('2019-12-01', '2019-12-02'),('2019-12-01', '2019-12-06'),
('2019-12-02', '2019-12-03'),('2019-12-04', '2019-12-10'),('2019-12-04', '2019-12-10'),('2019-12-05', '2019-12-13'),
('2019-12-16', '2019-12-19'),('2019-12-26', '2019-12-28'),('2019-12-26', '2020-01-01'),('2019-12-28', '2020-01-02'),
('2019-12-31', '2020-01-05'),('2020-01-03', '2020-01-08'),('2020-01-05', '2020-01-11'),('2020-01-06', '2020-01-09'),
('2020-01-06', '2020-01-11'),('2020-01-08', '2020-01-18'),('2020-01-11', '2020-01-15'),('2020-01-15', '2020-01-17'),
('2020-01-15', '2020-01-18');

INSERT INTO ROOMINFO (ID, `Type`,Max) VALUES
(1, "Family", 4), (2, "Family", 4), (3, "Family", 4), (4, "Dual", 2),
(5, "Dual", 2),   (6, "Dual", 2), (7, "Dual", 2),   (8, "Dual", 2),
(9, "Dual", 2),   (10, "Dual", 2);

INSERT INTO BOOKROOM( Ref, ID ) VALUES
(1, 4), (2, 3), (3, 4), (4, 5),(5, 6), (6, 7), (7, 3), (8, 2), (9, 1), (10, 8),(11, 3), 
(12, 9), (13, 2), (14, 10), (15, 4), (16, 5), (17, 6), (18, 7), (19, 2),(20, 1), (21, 10);

所需的输出：

id    (& some indication of partial availability?)
1  all
2  all
3  partial
4  partial
5  all
6  all
7  all
8  all
9  all
10  all

标签： mysqldatejoinselect

解决方案

忽略令人痛苦的命名政策......

DROP TABLE IF EXISTS book;

CREATE TABLE BOOK( Ref INT NOT NULL AUTO_INCREMENT, Start_Date DATE NOT NULL, End_Date DATE NOT NULL, PRIMARY KEY(Ref));

DROP TABLE IF EXISTS roominfo;
CREATE TABLE ROOMINFO( ID INT NOT NULL AUTO_INCREMENT, `Type` VARCHAR(10) NOT NULL, capacity TINYINT NOT NULL, PRIMARY KEY(ID));

DROP TABLE IF EXISTS bookroom;
CREATE TABLE BOOKROOM( Ref INT NOT NULL,ID INT NOT NULL);

INSERT INTO BOOK(Start_Date, End_Date) VALUES   
("2019-11-03", "2019-11-10"), ("2019-11-05", "2019-11-13");

INSERT INTO ROOMINFO (ID, `Type`,capacity) VALUES
(1, "Family", 4), (2, "Family", 4), (3, "Family", 4), (4, "Dual", 2),
(5, "Dual", 2),   (6, "Dual", 2), (7, "Dual", 2),   (8, "Dual", 2),
(9, "Dual", 2),   (10, "Dual", 2);

INSERT INTO BOOKROOM( Ref, ID ) VALUES (1, 4), (2, 3);

SELECT r.*
     , CASE WHEN b.ref IS NULL THEN 'all' ELSE 'partial' END status
  FROM roominfo r 
  LEFT 
  JOIN bookroom br 
    ON br.id = r.id 
  LEFT 
  JOIN book b 
    ON b.ref = br.ref 
   AND b.end_date >= '2019-11-01' AND b.start_date <= '2019-11-13'
 ORDER
    BY r.id;
+----+--------+----------+---------+
| ID | Type   | capacity | status  |
+----+--------+----------+---------+
|  1 | Family |        4 | all     |
|  2 | Family |        4 | all     |
|  3 | Family |        4 | partial |
|  4 | Dual   |        2 | partial |
|  5 | Dual   |        2 | all     |
|  6 | Dual   |        2 | all     |
|  7 | Dual   |        2 | all     |
|  8 | Dual   |        2 | all     |
|  9 | Dual   |        2 | all     |
| 10 | Dual   |        2 | all     |
+----+--------+----------+---------+

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