php - mysql check next and previous available period in room availability query -

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for project of mine add feature show previous , next available period in booking reservation system.

i have query checks if house available:

select id   tbl_reservations   (     `status` 'confirmed' or `status` 'total-payed'    ) , (      '2015-08-12' between checkin , checkout       or checkout between '2015-08-12' , '2015-08-13'      or '2015-08-12' between checkin , checkout      or checkin between '2015-08-12' , '2015-08-13'    );

if finds reservation in period, php script return false, shows message

"sorry, no availability in selected period"

i show like:

"the next available period stay of xx nights is: "

and show checkin , checkout date.

same thing previous period.

i not mastering sql 100%, here asking suggestions of kind point me in right direction.

here 2 solutions.

get next available reservation expected stay:

select id tbl_reservations (   `status` != 'confirmed' , `status` != 'total-payed'  ) , checkin = (select min(checkin) tbl_reservations                checkin > '2015-08-12'                  , checkout - checkin >= '2015-08-12' - '2015-08-13');

get previous reservation expected stay. 

select id   tbl_reservations   (     `status` != 'confirmed' , `status` != 'total-payed'    )   , checkin = (select max(checkin) tbl_reservations                  checkin < '2015-08-12'                  , checkout - checkin >= '2015-08-12' - '2015-08-13');

these can combined 1 query, question looked wanted 2 separate queries. these tested , ready go..


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