Question

我有两张桌子：

表objects：

object_id | object_group_id

表attributes：

attr_id | attr_object_id | attr_property_id | attr_value

现在，我希望将所有object_id放在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')

我试图构建一些查询，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'

......但仍然无法得到我需要的东西。

Answer 1

经过几个小时的结合和尝试，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

我太近了，通过将所有过滤条件移到INNER JOIN来完成此操作。

Answer 2

试试这个。我不知道为什么你有最后一行

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';

删除此行并进行测试

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

过滤具有多个条件的EAV表

2 个答案: