[英]mysql query - only select where id = id from another table and a field in that table = a value
my title may not explain what I am looking for, this is my current query for pulling in products for a shop: 我的标题可能无法解释我在寻找什么,这是我当前查询的为商店购买产品的信息:
mysql_query("SELECT * FROM Items
WHERE ((Items.menu_id='$menu_id' AND Items.status='1')
$colour_sql)
$order_sql
LIMIT $lim_from,$limit_per_page");
The part where it says $colour_sql I want to have somthing that says: 它说$ colour_sql的部分我想要的东西说:
AND (Items.id=colour.product_id AND colour.colour='pink')
So it only show products that are pink, with the colours being in a seperate table. 因此,它仅显示粉红色的产品,并且颜色在单独的表格中。 I have searched for answers, but I can't seem to find one explaining my situation, maybe its because I don't know exactly what i'm, looking for, any help is appreciated thanks.
我一直在寻找答案,但似乎找不到一个能说明我情况的答案,也许是因为我不知道自己到底在找什么,感谢您的帮助。
If you want to join with table colour
you need to do either a join or a subselect. 如果要使用表格
colour
进行联接,则需要进行联接或子选择。
Join 加入
$menu_id = mysql_real_escape_string($menu_id);
mysql_query = "SELECT i.*
FROM items i
INNER JOIN colour c ON (c.product_id = i.id)
WHERE i.menu_id = '$menu_id'
AND i.status = '1'
AND c.colour = 'pink'
ORDER BY .....
LIMIT {intval($limit_per_page)} OFFSET {intval($lim_from)} ";
Subselect 子选择
$menu_id = mysql_real_escape_string($menu_id);
mysql_query = "SELECT i.*
FROM items i
WHERE i.menu_id = '$menu_id'
AND i.status = '1'
AND i.id IN (SELECT c.product_id FROM colour c WHERE c.colour = 'pink')
ORDER BY .....
LIMIT {intval($limit_per_page)} OFFSET {intval($lim_from)} ";
maybe an inner join? 也许是内部联接?
[...]
FROM Items
INNER JOIN colour
ON colour.id = Items.colour_id
WHERE [blablabla]
AND colour.colour = 'pink'
You need to add the colour table to your query: 您需要将颜色表添加到查询中:
FROM Items,colour
or 要么
From Items INNER JOIN colour ON Items.id = colour.product_id
But I observed that you have the product_id in your colour table. 但是我观察到您的颜色表中有product_id。 Why don't you do the reverse in the Items table you add the colour id.
为什么不在Items表中做相反的操作,添加颜色ID。
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