Question

I am trying to write a query to check if the custom meta values in a custom post type(properties) when saved equals the meta values in another custom post type(alerts)

I can get this work for normal match fields however I am trying to get it to work for a range for example, if ‘bedrooms’ in ‘properties’ is between ‘a_bedrooms_min’ and ‘a_bedrooms_max’ in ‘alerts’. My Query looks like this so far:

//Property Meta Fields
$meta_type = 'flat';
$meta_bedrooms = '2';

//Alert Meta Fields
a_bedrooms_min = 1
a_bedrooms_max = 3

SELECT ID
    FROM wp_posts
    INNER JOIN wp_postmeta m1
        ON ( wp_posts.ID = m1.post_id )    
    INNER JOIN wp_postmeta m2
        ON ( wp_posts.ID = m2.post_id )
    INNER JOIN wp_postmeta m3
        ON ( wp_posts.ID = m3.post_id )
WHERE
     wp_posts.post_type = 'alerts'
     AND wp_posts.post_status = 'publish'
     AND ( m1.meta_key = 'a_property_type' AND m1.meta_value = '$meta_type' )
     AND ( m2.meta_key = 'a_bedrooms_min' AND m2.meta_value >= '$meta_bedrooms' )
     AND ( m3.meta_key = 'a_bedrooms_max' AND m3.meta_value <= '$meta_bedrooms' )
GROUP BY wp_posts.ID
ORDER BY wp_posts.post_date
DESC;

The last two ANDs obviously will not work with what I am trying to do but how would can get this to work?

Thanks
Robert

Answer 1

I think you are close. you have a hybrid old ANSI vs more explicit JOIN. As you can see in this example, each one of the 3 criteria is joined to the meta table on all 3 parts explicitly. So, the ID should only appear ONCE per ID as each of the meta SHOULD AT MOST return one record, and the record will only qualify if all 3 meta find the respective match.

SELECT 
      ID
   FROM 
      wp_posts

         INNER JOIN wp_postmeta m1
            ON wp_posts.ID = m1.post_id
           AND m1.meta_key = 'a_property_type'
           AND m1.meta_value = '$meta_type'

         INNER JOIN wp_postmeta m2
           on wp_posts.ID = m2.post_id
          AND m2.meta_key = 'a_bedrooms_min' 
          AND m2.meta_value <= '$meta_bedrooms'

         INNER JOIN wp_postmeta m3
           on wp_posts.ID = m3.post_id
          AND m3.meta_key = 'a_bedrooms_max' 
          AND m3.meta_value >= '$meta_bedrooms'

   WHERE
          wp_posts.post_type = 'alerts'
      AND wp_posts.post_status = 'publish'

   GROUP BY 
      wp_posts.ID

   ORDER BY 
      wp_posts.post_date DESC;

I’ve revised as I believe the <= and >= were actually backwards. For example, your MINIMUM bedrooms from the meta_value was 1 and max is 3… you are LOOKING for 2 to be qualified.

So, you NEED MIN_BEDROOMS <= 2 and the 2 <= MAX_BEDROOMS
what was originally presented is MIN_BEDROOMS >= 2 (1 is never greater than 2)
and MAX_BEDROOMS <= 2 (2 is never less than 2).

Try again.