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Editorial Team
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Asked: 2026-06-14T15:00:09+00:00

I have a working reservation query. This query checks which items are available for

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I have a working reservation query. This query checks which items are available for the time of reservation.

[PROJECT]: projectid, datefrom, dateto, …
[ITEM]: itemid, itemgroupid, …
[ITEMGROUP]: itemgroupid, itemgroupname, …
[RESERVELIST]: itemid, projectid, reservelistnr 

SELECT *
FROM item i inner join itemgroup ig on i.itemgroupid = ig.itemgroupid
WHERE i.itemid NOT IN  (
                        SELECT r.itemid 
                        FROM reservelist r inner join project p on r.projectid = p.projectid
                        WHERE p.datefrom BETWEEN '$datefrom' AND '$dateto'
                        OR p.dateto BETWEEN '$datefrom' AND '$dateto'
                        OR '$datefrom' BETWEEN p.datefrom AND p.dateto
                        OR '$dateto' BETWEEN p.datefrom AND p.dateto
                        )
ORDER BY itemid

$datefrom and $dateto are the dates of the time of reservation.
Now this query works well, but if someone make a reservation between 08:00 – 21:00, the next reservation can only be done at 21:01 and not at 21:00 sharp. So I need to have a smaller than and greater than.

I played alot with the < and >, but somehow it doesn’t seem to work.

My best guess is that this should be the good solution:

SELECT *
FROM item i inner join itemgroup ig on i.itemgroupid = ig.itemgroupid
WHERE i.itemid NOT IN  (
                        SELECT r.itemid 
                        FROM reservelist r inner join project p on r.projectid = p.projectid
                        WHERE p.datefrom > '$datefrom' AND p.datefrom < '$dateto'
                        OR p.dateto > '$datefrom' AND p.dateto < '$dateto'
                        OR '$datefrom' > p.datefrom AND '$datefrom' < p.dateto
                        OR '$dateto' > p.datefrom AND '$dateto' < p.dateto
                        )
ORDER BY itemid

Unfortunately, it isn’t.

Anyone any idea?

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1 Answer

  1. Editorial Team
    WHERE i.itemid NOT IN  (
                        SELECT r.itemid 
                        FROM reservelist r inner join project p on r.projectid = p.projectid
                        WHERE p.datefrom BETWEEN '$datefrom' AND '$dateto'
                        OR p.dateto BETWEEN '$datefrom' AND '$dateto'
                        OR '$datefrom' BETWEEN p.datefrom AND p.dateto
                        OR '$dateto' BETWEEN p.datefrom AND p.dateto
                        )

    Works.

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