MySQL - selecting all rooms including partial date ranges - mysql

Question

Im currently have room availability present which displays current open rooms for bookings given a specified date range.
I need to display the same availability but instead of displaying rooms for the FULL availability i need to show partial availability.
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
query:
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;
example structure & data:
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);
desired output:
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

Answer 1

Ignoring the distressing naming policy...
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 |
+----+--------+----------+---------+