Question

This already involves four INNER JOINs and one LEFT JOIN, but I am not sure how I can reference one more table that is similar to the LEFT JOIN table.

Here is my current query which works as it is suppose to

 SELECT xp.productid, xp.product, xc.classid, xco.optionid, xco.option_name, xiW.id, xiW.image_path, count(xvi.variantid) as cnt
    FROM xcart_products xp
    INNER JOIN xcart_variants xv ON xp.productid = xv.productid
    INNER JOIN xcart_variant_items xvi ON xv.variantid = xvi.variantid
    INNER JOIN xcart_class_options xco ON xvi.optionid = xco.optionid
    INNER JOIN xcart_classes xc ON xco.classid = xc.classid AND xc.class = 'COLOR'
    LEFT JOIN xcart_images_W xiW ON xiW.id = xvi.variantid
    GROUP BY xco.optionid
    ORDER by xp.product DESC

So essentially each product has both a class and a variant, then each class has class options, and each variant has variant items. The variants have their own variant image and each class has it’s own ‘detailed’ image (xcart_images_D). As of now I am referencing the variant images but what I would like to do is instead of counting xvi.variantid I want to count how many detailed images there are for each of optionid.

I have a query which will do this but unfortunately I cannot use this query to pull xcart_images_W. That query is belo

 SELECT xp.productid, xp.product, xc.classid, xco.optionid, xco.option_name, xiD.image_path, xiD.path_on_server, count(xiD.optionid) as cnt
    FROM xcart_products xp
    INNER JOIN xcart_classes xc ON xp.productid = xc.productid AND xc.class = 'Color'
    INNER JOIN xcart_class_options xco ON xc.classid = xco.classid
    LEFT JOIN xcart_images_D xiD ON xiD.optionid = xco.optionid
    GROUP BY xp.product, xco.optionid
    ORDER by xp.product DESC

Is it possible to reference these two tables or do their foreign keys make it impossible to do so?

Below I have provided the table structures.

+ xcart_products
    - productid*
    - product
+ xcart_variants
    - variantid*
    - productid (xcart_products.productid)
+ xcart_variant_items [bridge table]
    - optionid*
    - variantid (xcart_variants.variantid)
+ xcart_classes
    - classid*
    - productid (xcart_products.productid)
    - class
+ xcart_class_options
    - optionid*
    - option_name
    - classid (xcart_classes.classid)
+ xcart_images_W
    - imageid*
    - id (xcart_variants.variantid)
    - image_path
+ xcart_images_D
    - imageid* [not relational with xcart_images_W.imageid]
    - id (xcart_products.productid)
    - optionid (xcart_class_options.optionid)
    - image_path

* Primary Key
() relational data
[] notes

Currently working but messy query. How do I clean up?

 SELECT xp.productid, xp.product, xc.classid, xco.optionid, xco.option_name, xiW.id, xiW.image_path
 FROM xcart_products xp
 INNER JOIN xcart_variants xv ON xp.productid = xv.productid
 INNER JOIN xcart_variant_items xvi ON xv.variantid = xvi.variantid
 INNER JOIN xcart_class_options xco ON xvi.optionid = xco.optionid
 INNER JOIN xcart_classes xc ON xco.classid = xc.classid AND xc.class = 'COLOR'
 LEFT JOIN xcart_images_W xiW ON xiW.id = xvi.variantid
 LEFT JOIN (
 SELECT COUNT(xiD.optionid) as dCount 
    FROM xcart_products xp2
    INNER JOIN xcart_classes xc2 ON xp2.productid = xc2.productid AND xc2.class = 'Color'
    INNER JOIN xcart_class_options xco2 ON xc2.classid = xco2.classid
    LEFT JOIN xcart_images_D xiD ON xiD.optionid = xco2.optionid
 ) ON xiW.id = xvi.variantid
 GROUP BY xco.optionid
 ORDER by xp.product DESC

Answer 1

It’s not entirely clear until you provide table definition. Have you tried replacing count(xvi.variantid) with count(xiW.id) in the first query?

updated:

SELECT xp.productid, xp.product, xc.classid, xco.optionid, xco.option_name, xiW.id, xiW.image_path, count(xvi.variantid) as cnt
FROM xcart_products xp
INNER JOIN xcart_variants xv ON xp.productid = xv.productid
INNER JOIN xcart_variant_items xvi ON xv.variantid = xvi.variantid
INNER JOIN xcart_class_options xco ON xvi.optionid = xco.optionid
INNER JOIN xcart_classes xc ON xco.classid = xc.classid AND xc.class = 'COLOR'
LEFT JOIN (
   SELECT COUNT(xiD.id) as Dcount 
   FROM xcart_images_D xiD 
   INNER JOIN xcart_images_W xiW ON xiW.column = xiD.column /*please update accordingly */
 ) ON xiW.id = xvi.variantid 
GROUP BY xco.optionid
ORDER by xp.product DESC

updated again:

SELECT xp.productid, xp.product, xc.classid, xco.optionid, xco.option_name, xiW.id, xiW.image_path, count(xvi.variantid) as cnt, xiD.totalD
FROM xcart_products xp
INNER JOIN xcart_variants xv ON xp.productid = xv.productid
INNER JOIN xcart_variant_items xvi ON xv.variantid = xvi.variantid
INNER JOIN xcart_class_options xco ON xvi.optionid = xco.optionid
INNER JOIN xcart_classes xc ON xco.classid = xc.classid AND xc.class = 'COLOR'
LEFT JOIN (
   SELECT count(xiD.id) as totalD, xiD.optionid FROM xcart_images_D xiD WHERE xiD.optionid = xvi.optionid
) ON xiD.optionid = xvi.optionid
GROUP BY xco.optionid
ORDER by xp.product DESC