检查酒店预订系统的房间可用性

Question

I'm trying to check available rooms in booking system so I have two tables: table of rooms called chambre ( id , name ) and table reservation_client ( id , start , end , id_chambre ) the start and end are the check in and checkout dates.

My query is:

$sql = "
SELECT * 
  FROM chambre 
 WHERE id NOT IN 
    (SELECT id_chambre 
       FROM reservation_client 
     WHERE end < '2019-07-20'  
        AND start > '2019-07-19 '
    )";

But its not giving me any result.

Answer 1

There is extra space in the value for the column start . Please remove that and check. Should work. You can use below query

$sql = "SELECT * FROM chambre WHERE id NOT IN (SELECT id_chambre FROM reservation_client WHERE end < '2019-07-20' AND start > '2019-07-19')";

Also, as suggested in comments you should post sample data or table schema for our better understanding.