使用多个条件过滤 EAV table

Question

我有 2 个表：

Table objects:

object_id | object_group_id

Table attributes:

attr_id | attr_object_id | attr_property_id | attr_value

现在，我想获取所有 object_id 其中 object_group_id = 1 并过滤两个属性：

(attr_property_id = 1 AND attr_value <= '100000')
   AND 
(attr_property_id = 2 AND attr_value > '2000')

我正在尝试构造一些查询，如下所示：

SELECT * FROM objects as o

/* filter1 join */
INNER JOIN 
    attributes AS f1 
        ON 
    o.object_id = f1.attr_object_id 
        AND 
    f1.attr_property_id = 1

/* filter2 join */
INNER JOIN 
    attributes AS f2 
        ON 
    f1.attr_object_id = f2.attr_object_id 
        AND 
    f2.attr_property_id = 2

WHERE 
    o.object_group_id = 1
       AND
   f1.attr_value <= '100000'
       AND
   f2.attr_value > '2000'

...但还是得不到我想要的

Answer 1

试试这个。我不确定你为什么有最后几行

SELECT
  o.object_id, o.object_group_id,
  f1.attr_value AS val1,
  f2.attr_value AS val2,
FROM objects AS o
LEFT JOIN attributes f1 ON o.object_id = f1.attr_object_id AND f1.attr_property_id = 1
LEFT JOIN attributes f1 ON o.object_id = f2.attr_object_id AND f2.attr_property_id = 2
WHERE
    o.object_group_id = 1
AND
   f1.attr_value <= '100000'
AND
   f2.attr_value > '2000';

删除这行并测试它

AND
   f1.attr_value <= '100000'
AND
   f2.attr_value > '2000';

Answer 2

经过几个小时的组合和尝试，我终于做到了：

    SELECT * FROM objects as o

/* filter1 join */
INNER JOIN 
    attributes AS f1 
        ON 
    o.object_id = f1.attr_object_id 
        AND 
    f1.attr_property_id = 1
        AND
    f1.attr_value <= '100000'

/* filter2 join */
INNER JOIN 
    attributes AS f2 
        ON 
    f1.attr_object_id = f2.attr_object_id 
        AND 
    f2.attr_property_id = 2
        AND
    f2.attr_value > '2000'

WHERE 
    o.object_group_id = 1

我太接近了，通过将所有筛选条件移动到 INNER JOIN。

使用多个条件过滤 EAV table

Filtering EAV table with multiple conditions

mysql

sql

entity-attribute-value