與多個條件

Question

過濾EAV表我有2個表：

表objects：

object_id | object_group_id 

表attributes：

attr_id | attr_object_id | attr_property_id | attr_value 

現在，我想所有object_id其中object_group_id = 1和過濾器兩個屬性：

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

我試圖建立一些疑問，比如：

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' 

...但還是不能讓我需要什麼。

Answer 1

相結合，努力的幾個小時後，我終於做到：

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，並通過將所有過濾條件移至INNER JOIN來完成此操作。

Answer 2

試試這個。我不知道爲什麼你有最後的行

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'; 

刪除此行並對其進行測試也

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