hotel booking check empty room between arrival date and departure date?

问题:

Basically i retrieve all available room with arrival and departure date from the room table.

SQL Query

SELECT * FROM `roomcalendar` where day BETWEEN '2016-08-25' and '2016-08-31' 

Result is

id day        roomname avaroom  1 2016-08-25 RoomA          0  2 2016-08-26 RoomA          2  3 2016-08-27 RoomA          0  4 2016-08-28 RoomA          1  5 2016-08-29 RoomA          1  6 2016-08-30 RoomA          0  7 2016-08-31 RoomA          1 

I just want available room if avaroom not equal to 0 beteen arrival date and departure date

And I want the result

SQL Query

SELECT * FROM `roomcalendar` where day BETWEEN '2016-08-25' and '2016-08-31' 

it must be empty result

SQL Query

 SELECT * FROM `roomcalendar` where day BETWEEN '2016-08-25' and '2016-08-26' 

it must be empty result

SQL Query

 SELECT * FROM `roomcalendar` where day BETWEEN '2016-08-26' and '2016-08-27' 

it show one result

SQL Query

SELECT * FROM `roomcalendar` where day BETWEEN '2016-08-26' and '2016-08-28' 

it must be empty result

SQL Query

SELECT * FROM `roomcalendar` where day BETWEEN '2016-08-28' and '2016-08-30' 

it show two result

Thanks.

回答1:

I just want available room if avaroom not equal to 0 beteen arrival date and departure date

So if you reformulate this:

• you want the room if there is no row where avaroom = 0 between two dates.

Translated in SQL:

select * from roomcalendar where day between '2016-08-25' and '2016-08-31' and not exists (   select * from roomcalendar   where day between '2016-08-25' and '2016-08-31'   and avaroom = 0 ); 

You can also reformulate by saying:

• you want the room if the number of rows where avaroom is not 0 is the total number of rows expected (in this case, this corresponds to the amount of days)

Translated in SQL:

select * from roomcalendar where day between '2016-08-25' and '2016-08-31' and avaroom != 0 having count(*) = datediff('2016-08-31','2016-08-25') + 1 

You might have to tweak the queries a bit, but that should point you to the right direction.

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