我有3张桌子:
**user**
idnumber | fullname
2015-01 sample doe
**Equipment**
id | Equipment
1 mic
2 Extension
**Reservation_list**
id | idnumber | reserve_slot | description | equip_id |
1 2015-011 1 sample 1
2 2015-011 2 sample2 2
**reservation slots**
id | reservation_int | reservation_out
1 10:00 12:00
2 1:00 2:00
我在这里得到了这个号码:
index.php?idnumber=?2015-011
$idnumber = $_GET['idnumber'];
如何才能得到这样的结果:(正如你可以看到2个表加入reservation_list和reservation_slots
reservation_int | reservation_out | description | equipment |
10:00 12:00 sample mic
1:00 2:00 sample2 extension
如您所见,它显示“2015-011”的所有记录。
答案 0 :(得分:2)
我不确定你在这里需要LEFT JOIN
。一个简单的INNER JOIN
将更有效率,并为您提供所需的一切:
SELECT
RS.reservation_int,
RS.reservation_out,
RL.description
FROM
user
INNER JOIN Reservation_List RL ON user.idnumber = RL.idnumber
INNER OUTER JOIN Reservation_Slots RS ON RL.ID = RS.ID
WHERE user.idnumber = '2015-011'
如果您的要求已更改,并且您需要列出有关user
的信息以及任何预订类型信息(如果可用)。然后你可以切换到LEFT OUTER JOIN
。
答案 1 :(得分:0)
SELECT R1.description,
R2.reservation_int,
R2.reservation_out
FROM user AS u
INNER JOIN reservation_List AS R1 ON (u.idnumber = R1.idnumber)
INNER JOIN equipment as E ON(E.id = R1.equip_id)
INNER JOIN reservation_slots AS R2 ON(R1.reserve_slot = R2.id)
WHERE u.idnumber = "2015-011"