预订日期范围mysql php

Question

Again booking system and dates ranges. I've read this topic Comparing date ranges and many others, but can't find answer :(

Please see SQLFiddle http://sqlfiddle.com/#!2/89b2b/2

I have booking table, that have ID , ObjectID , PeriodStart and PeriodEnd fields of type DATE in MySQL
My example data looks like this:

(1, 3, '2014-08-07', '2014-08-14'),
(2, 3, '2014-08-19', '2014-08-23'),
(3, 2, '2014-08-13', '2014-08-15'),
(4, 2, '2014-08-19', '2014-08-21');

My query dates interval is ( updated , was $from = '2014-08-14'; ):

$from = '2014-08-15';
$to = '2014-08-19'

I'd like to get ObjectID s that are free on query dates interval.
Problem is that, object's 2 first reservation ends on 2014-08-15 and we want to make new booking started from 2014-08-15 . Same thing with ending date 2014-08-19 . Existing reservations start on this day. It's ok for humans because we calculate date periods as nights , but how to tell same thing to MySQL ?

For these variables

$from = '2014-08-15';
$to = '2014-08-19'

I'd like to get [2, 3] as the result of query.

For second query

$from = '2014-08-14';
$to = '2014-08-19'

I'd like to get only [3] as the result of query, because ObjectID 2 is booked from 13 aug to 15 aug

Answer 1

The full code is:

SELECT DISTINCT ObjectID
FROM booking
WHERE ObjectID IN
(
SELECT ObjectID
FROM booking
WHERE PeriodStart <= '2014-08-19' AND PeriodEnd >= '2014-08-14'
)

#

+----------+
| OBJECTID |
+----------+
|        2 |
|        3 |
+----------+

Fiddle: http://sqlfiddle.com/#!2/89b2b/90

Answer 2

You just have a situation where the end date is not inclusive. I would express the query as:

select b.objectid
from booking b
group by b.objectid
having sum(b.PeriodStart < '2014-08-19' and B.PeriodEnd > '2014-08-14') = 0

This counts the number of times there is a booking that covers the nights you care about. If there are any, then the object is filtered out.

Answer 3

This also seems working? am i missing anything in question

SELECT DISTINCT(ObjectID)
FROM booking
WHERE PeriodStart <= '2014-08-19' AND PeriodEnd >= '2014-08-14'

Answer 4

SELECT DISTINCT ObjectID
  FROM booking
 WHERE PeriodStart <= '2014-08-19' 
   AND PeriodEnd >= '2014-08-14';

http://sqlfiddle.com/#!2/89b2b/15