预订会议室； 在给定的时间内选择可用的房间

Question

我正在制作一个会议室预订系统，您可以在该系统中选择一个特定的时间段，然后在那个时候获得可用的房间。 某些表的名称是法文，因此在需要时我将提供（）之间的含义。 我的问题是，当我选择时间时，甚至没有可用的房间。 而且我认为我的查询存在一些问题。 因此，我有一个预订桌，教授桌和萨尔（法语中的指间）表。 预订表包含以下列：idReservation，dateReservation，hDebut（这是会议的开始时间），hFin（结束时间），idSalle（会议室ID）

这是创建表的查询：如果您不理解某些列的名称（例如我用法语说的），请发表评论。

CREATE TABLE `reservation` (
  `idReservation` int(11) NOT NULL,
  `dateReservation` date DEFAULT NULL,
  `hDebut` time NOT NULL,
  `hFin` time NOT NULL,
  `dateModificationReservation` date DEFAULT NULL,
  `motifReservation` varchar(50) NOT NULL,
  `idSalle` int(11) NOT NULL,
  `idProf` int(11) NOT NULL,
  `etatreserv` int(10) NOT NULL
) 

etatreserv（等待2个，拒绝1个，接受0个）代表房间的状态，因为用户发送了一段预定时间的房间预订请求，并且管理员可以选择接受/拒绝，即使房间是可得到

INSERT INTO `reservation`(`idReservation`, `dateReservation`, `hDebut`, `hFin`, `dateModificationReservation`, `motifReservation`, `idSalle`, `idProf`, `etatreserv`) VALUES (1,'2019-06-14','15:00:00','18:00:00','2019-06-09','administrative meeting',1,12,2)

CREATE TABLE `salle` (
  `idSalle` int(11) NOT NULL,
  `intitule` varchar(40) NOT NULL,
  `NumeroSalle` int(255) NOT NULL
)

INSERT INTO `salle` (`idSalle`, `intitule`, `NumeroSalle`) VALUES
(1, 'salle de reunion 1', 1),
(10, 'salle 18', 18);

CREATE TABLE `professeur` (
  `idProf` int(11) NOT NULL,
  `nomProf` varchar(50) NOT NULL,
  `prenomProf` varchar(50) NOT NULL,
  `tel` int(10) UNSIGNED NOT NULL,
  `email` varchar(255) NOT NULL,
  `profpwd` varchar(255) NOT NULL,
  `dateAddProf` date NOT NULL,
  `dateModificationProf` date NOT NULL,
  `idDepart` int(11) NOT NULL
)

INSERT INTO `professeur` (`idProf`, `nomProf`, `prenomProf`, `tel`, `email`, `profpwd`, `dateAddProf`, `dateModificationProf`, `idDepart`) VALUES
(12, 'ddd', 'dd', 444, 'email@email.com', 'pwd', '2019-06-05', '2019-06-05', 5);

我已经尝试过的东西：

SELECT * FROM reservation left OUTER JOIN salle on reservation.idSalle = salle.idSalle WHERE (
    (reservation.dateReservation IS NULL) 
    OR 
    (reservation.dateReservation != ':dateReservation')
     OR 
     ((reservation.dateReservation = ':dateReservation') AND (reservation.hDebut NOT BETWEEN ':hDebut' AND ':hFin') AND (reservation.hFin NOT BETWEEN ':hDebut' AND ':hFin'))
      OR
       ((reservation.dateReservation = ':dateReservation') AND (reservation.hDebut >':hDebut' AND  reservation.hFin <':hFin'))   
     )

然后我尝试了一个更简化的版本：

    dateReservation = ':dateReservation' AND
    (hDebut BETWEEN ':hDebut' AND ':hFin' OR hFin BETWEEN ':hDebut' AND ':hFin' OR
    (hDebut < ':hDebut' AND hFin > ':hFin'))))```

example : 
salle table 
idSalle | name
1       |salle de reunion 1
10      |salle18
3       |salle3 

reservation table 
idReservation|dateReservation|hDebut   |hFin     |idSalle
1            |2019-06-14     |15:00:00 |18:00:00 |1

if for example  i choose dateReservation = 2019-06-14, hDebut=16:00:00,
hFin = 17:00:00 then all i should see are : salle2 and salle3 

PS : I'm new to stackoverflow and the syntax highlighting confused me a bit, so I'm sorry if my code doesn't show up as it should.

Answer 1

    DROP TABLE IF EXISTS salle;

    CREATE TABLE salle 
    (salle_id SERIAL PRIMARY KEY
    ,name VARCHAR(12) UNIQUE
    );

    INSERT INTO salle VALUES
    (1,'salle1'),
    (2,'salle2'),
    (3,'salle3');


    DROP TABLE IF EXISTS reservation ;

    CREATE TABLE reservation 
    (reservation_id SERIAL PRIMARY KEY
    ,reservation_from DATETIME NOT NULL
    ,reservation_to DATETIME NULL
    ,salle_id INT NOT NULL
    );

    INSERT INTO reservation VALUES
    (1,'2019-06-14 15:00:00','2019-06-14 18:00:00',1);

    SELECT s.*
      FROM salle s
      LEFT 
      JOIN reservation r
        ON r.salle_id = s.salle_id
       AND reservation_from <= '2019-06-14 17:00:00'
       AND reservation_to  >= '2019-06-14 16:00:00'
     WHERE r.reservation_id IS NULL;

+----------+--------+
| salle_id | name   |
+----------+--------+
|        2 | salle2 |
|        3 | salle3 |
+----------+--------+