Question

i want to create a php with mysql to do the following:

lets say that i have a shop i want to rent, rent will be weekly or monthly. I’m searching for the best way to create this table, so i can do easy queries to calculate free weeks or months.

EDIT

let say i have

ID, START_DATE,RENING_TYPE,CLIENT_ID

where Start_date is the start date for renting, and RENTING_TYPE is weekly or monthly

how should i run a query to know all the empty weeks or month so new clients may reserve that week/month

for example a client reserve July month another client reserve the first week in June, if a new client logged in to my system and want to check all the available weeks/months, how can i achieve that ?

Answer 1

This query should return all the free intervals between bookings. It gets all suspected free days (end day + 1) if they have not already been booked, then it searches to find the next booked day. Giving you output like this

Start Free | End Free
-----------------------
2011-02-03 | 2011-02-06
2011-02-08 | 2011-02-12
2011-02-20 | 2011-03-02

You can then get the exact dates inbetween using PHP.

The query:

SELECT DATE_ADD(r2.end_date, INTERVAL 1 DAY), 
(
    SELECT DATE_SUB(MIN(starting_date), INTERVAL 1 DAY)
    FROM renting_table as r1
    WHERE r1.starting_date > r2.end_date
)   
FROM renting_table as r2
WHERE DATE_ADD(end_date, INTERVAL 1 DAY) not in
(
    SELECT r3.start_date
    FROM renting_table as r3
)

Note: I’m very rusty with SQL so the syntax will probably be off but I think the logic is sound. I hope this gives you a nod in the right direction at least!