Filtering EAV table with multiple conditions

问题

I have 2 tables:

Table objects:

object_id | object_group_id

Table attributes:

attr_id | attr_object_id | attr_property_id | attr_value

Now, I want to get all object_id where object_group_id = 1 and filters two attributes:

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

I was trying to construct some queries, like this:

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'

... but still can't get what I need.

回答1:

After couple hours of combining and trying, I finally did:

    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

I was too close, and done this by moving all filter conditions to INNER JOIN.

回答2:

Try this. I am not sure why do you have the last lines

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';

remove this lines and test it also

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

来源：https://stackoverflow.com/questions/33422569/filtering-eav-table-with-multiple-conditions

标签

mysql

sql

entity-attribute-value