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| Title : |
You have a set of many resources , and You need to know wich of these resources are available for a given use during a given period but MySql does not allow SUB-Selection :(
here is the right way to do that in a single query
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| Categories : |
MySQL, General SQL, Databases, Algorithms |
Benedetto Patrice |
| Date : |
Jul 17th 2000 |
| Grade : |
3 of 5 (graded 3 times) |
| Viewed : |
4860 |
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| Tools : |
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# having for example a room and reservations database handling room_num and dates
SELECT rooms.num , rooms.type # ... all you need to know
FROM rooms
LEFT JOIN reservations on
( ( reservations.start <= "Date begin" AND reservations.end >= "Date begin" )
OR ( reservations.start <= 'Date dep" AND reservations.end >= 'Date dep" )
OR ('Date dep" >= reservations.start AND"Date begin" <= reservations.start ) )
and reservations.room_num = room.num
where reservations.room_num IS NULL
# enjoy
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