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如何链接并获取三个表的变量,我想获取每个房间的链接设施,但目前我的记录似乎没有返回任何内容。SQL查询不返回任何内容
我想返回设施新的列标题,以及:http://sqlfiddle.com/#!2/8d6ca/25
小提琴可以在这里找到
SELECT *
FROM ts_room rm
WHERE
NOT EXISTS (
SELECT 1
FROM ts_roompref rp
JOIN ts_request rq ON rp.request_id = rq.id AND day_id = 1 AND period_id = 1
WHERE rm.id = rp.room_id)
AND NOT EXISTS (
SELECT 1
FROM ts_roompref rp
JOIN ts_allocation a ON rp.request_id = a.request_id AND a.status = "Allocated"
WHERE rm.id = rp.room_id)
AND EXISTS (
SELECT 1
FROM ts_roomfacilities f
JOIN ts_room b ON f.room_id = b.id
WHERE rm.id = f.room_id AND
f.facilities_id=2);
AND EXISTS (
SELECT 1
FROM ts_facilities f1
JOIN ts_roomfacilities c ON f2.id = c.id
WHERE rm.id = f.room_id);
由于过于本地化而关闭。 – djechlin 2013-02-18 00:35:15
我认为从第二行开始还有一个错字。 'JOIN ts_roomfacilities c ON f2.id = c.id'应该是'JOIN ts_roomfacilities c ON f1.id = c.id'? – 244an 2013-02-18 01:01:47