Question

I am doing project of hotel booking system in php and mysql
I created the rooms table which is below

room_no| roo_id | room_type
 D1     |  1     | Deluxe
 R1     |  2     | AC
 R2     |  3     | Non Ac
 C1     |  4     | Cottage

this table is about rooms represent total rooms in hotel.

this is customer_booking table,

customer_id | Cust_name | email | Address | room_type | room_no| cost|check_in | check_out
1 | satyawan |[e-mail]| xy | AC       |  R1    |5000 | 2012-12-26|2012-12-30
2 |satyawan  |   [e-mail]|unr  |  Non A/C | R6 |            20002012-01-01|2012-12-07
3 |satyawan  |   [e-mail]|unr  |  Non A/C | R8 |            2013-01-01  |2013-01-10
4 |satyawan  |   [e-mail]|unr  |  Non A/C | R9 |            2013-01-10 |2013-01-16
5 |satyawan  |   [e-mail]|unr  |  Non A/C | R6 |            2013-01-01 |2013-01-20

i have fired query on join of this both table for sort data of unbooked rooms. the query is below

SELECT *
FROM rooms 
LEFT JOIN customer_booking  
ON customer_booking.room_no = rooms.room_no
WHERE customer_booking.client_id IS NULL
OR (customer_booking.check_out >= 2013-01-01
AND customer_booking.check_in >= 2013-01-10)
OR (customer_booking.check_out <= 2013-01-01
AND customer_booking.check_out <= 2013-01-10)

but i want only data of unbooked rooms only.
if rooms is already book then it have to show that this room is already book on this date.

i cant get any idea about it.

Answer 1

Try to use this query. If the last field room_customer_id is 0 then room is free otherwise it shows customer_id who reserved this room.

SELECT rooms.*,COALESCE(customer_booking.customer_id,0) room_customer_id
FROM rooms 
LEFT JOIN customer_booking  ON 
   (customer_booking.room_no = rooms.room_no)
   and 
   (
      ('2013-01-01' between customer_booking.check_in and customer_booking.check_out)
      or 
      ('2013-01-10' between customer_booking.check_in and customer_booking.check_out)
      or 
      (customer_booking.check_in between '2013-01-01' and '2013-01-10')
    )