如何使产品具有所有请求的属性
SELECT * FROM `oc_product_attribute` WHERE (`attribute_id`=15 AND `text`="2500") OR (`attribute_id`=18 AND `text`="24")此请求,返回如下结果:
|product_id | attribute_id | language_id | text
+-----------+--------------+-------------+-----
|1 | 15 | 1 | 2500
|2 | 15 | 1 | 2500
|3 | 15 | 1 | 2500
|4 | 15 | 1 | 2500
|3 | 18 | 1 | 24
|4 | 18 | 1 | 24 但我只需要产品3和4,因为他们有15=2500和18=24。我是怎么做到的?
发布于 2015-03-01 10:39:37
SELECT product_id
FROM oc_product_attribute
WHERE (attribute_id,text) IN ((15,'2500'),(18,'24'))
GROUP
BY product_id
HAVING COUNT(DISTINCT attribute_id,text) = 2;我有一种感觉,这个速记否定了索引的使用,但希望您能理解。
发布于 2015-03-01 10:33:38
如果您想匹配多个条件并返回匹配所有条件的值,那么这里有一种方法
select p1.* from oc_product_attribute p1
where
p1.`attribute_id`=15 AND p1.`text`='2500'
and exists
(
select 1 from oc_product_attribute p2
where
p2.attribute_id = 18
and p2.text = 24
and p1.product_id = p2.product_id
)
union all
select p1.* from oc_product_attribute p1
where
p1.`attribute_id`=18 AND p1.`text`='24'
and exists
(
select 1 from oc_product_attribute p2
where
p2.attribute_id = 15
and p2.text = 2500
and p1.product_id = p2.product_id
)
;https://stackoverflow.com/questions/28792369
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