问题描述
我在使用sql查询时遇到了问题,实际上是一个简单的查询,但是我无法弄清缺少的内容,所以我来寻求您的帮助...所以,我要做的
I have a problem with an sql query, actually a simple query but I can't figure up what am I missing, so I came to ask your help...So, what i have to do
我有两个桌子rooms
和rooms facilities
...,我必须选择具有所需设施的房间.
I have two tables rooms
and rooms facilities
...and I have to select the rooms with desired facilities..
如果我使用以下查询选择具有一个设施(id = 4-id_fu-的设施)的房间...
If I select a room with one facility (facility with id=4 - id_fu - )...using the following query
SELECT u.* FROM rooms u
JOIN facilities_r fu
ON fu.id_uc = u.id_uc
AND fu.id_fu = '4'
WHERE 1
AND vizibility='1'
GROUP BY id_uc
ORDER BY u_premium desc, id_uc DESC
一切正常.
但是,如果我要选择具有更多设施的房间,那么可以使用以下查询,例如id = 4和id = 3的设施.
But if I want to select the room with more facilities, let's say facilities with id=4, and id=3 ..using the following query
SELECT u.* FROM room u
JOIN facilities_r fu
ON fu.id_uc=u.id_uc
AND fu.id_fu = '4'
AND fu.id_fu = '3'
WHERE 1
AND vizibility = '1'
GROUP BY id_uc
ORDER BY u_premium DESC, id_uc DESC
它不起作用.
我不明白为什么它不起作用,但我不知道如何处理该情况...
I can't understand why it doesn't work, but I can't figure up how to put the condition...
谢谢,米海
推荐答案
您可以用括号将条件分组.当您检查一个字段是否等于另一个字段时,您想使用OR
.例如WHERE a='1' AND (b='123' OR b='234')
.
You can group conditions with parentheses. When you are checking if a field is equal to another, you want to use OR
. For example WHERE a='1' AND (b='123' OR b='234')
.
SELECT u.*
FROM rooms AS u
JOIN facilities_r AS fu
ON fu.id_uc = u.id_uc AND (fu.id_fu='4' OR fu.id_fu='3')
WHERE vizibility='1'
GROUP BY id_uc
ORDER BY u_premium desc, id_uc desc
这篇关于MySQL联接有多个条件的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!