Question

My first post here.

I am trying to sort values displayed from my products table with values inside my products_categories table.

my products table contains the following fields:

id | psku | pname | pdescription

My products_categories table has the following fields:

id | psku | subcategory | orderid

The site I am building is a small eshop, which contains several subcategories. The setup at this time allows me to have 1 product added to multiple categories.

For example, product sku# 6001 would be listed in 2 subcategories, cosmetics & eyelashes. I would have then 2 entries in my products_subcategories table like so:

id | psku | subcategory | orderid
1 | 6001 | cosmetics | 1
2 | 6004 | eyelashes | 1
3 | 6003 | cosmetics | 2
4 | 6011 | cosmetics | 3
5 | 6020 | eyelashes | 2
6 | 6045 | cosmetics | 4

I am currently using the following query to display data in each subcategory:

SELECT * FROM products LEFT JOIN products_subcategories 
ON products.psku = products_subcategories.psku 
WHERE products.psku IN ('6001','6003','6011','6020','6045') 
GROUP BY e2o_products_subcategories.psku 
ORDER BY e2o_products_subcategories.orderid ASC

This should display my result as so:

Cosmetics:
PSKU 6001
PSKU 6003
PSKU 6011
PSKU 6045

eyelashes:
PSKU 6004
PSKU 6020

It doesn’t seem to work. Tried some other combinations, with worst result. The products show, but will not sort by orderid

Would someone have a possible solution to this problem. I can provide sample data if needed.

Thank you.

Answer 1

I have had a look at the sampledata.php file that you have created. I am struggling to make sense of what you are trying to do. Why are you running two queries? Surely you could achieve the same result with a single query.

Your first query will return a list of pskus that you are then passing into the second query –

SELECT psku, subcategory
FROM products_subcategories
WHERE subcategory = 'cosmetics'

+------+-------------+
| psku | subcategory |
+------+-------------+
| 6018 |  cosmetics  |
| 6017 |  cosmetics  |
| 6022 |  cosmetics  |
| 6025 |  cosmetics  |
+------+-------------+

The second query is then –

SELECT DISTINCT products.*
FROM e2o_products
INNER JOIN e2o_products_subcategories 
    ON e2o_products.psku = e2o_products_subcategories.psku 
WHERE e2o_products.pstatus =  '1' 
AND e2o_products.psku IN (6018,6017,6022,6025)
GROUP BY e2o_products.psku
ORDER BY e2o_products_subcategories.dsporder DESC

Given that you are only retrieving the fields from the products table you can just do –

SELECT p.*
FROM products p
INNER JOIN products_subcategories ps
    ON p.psku = ps.psku 
WHERE p.pstatus = 1
AND ps.subcategory = '$subcat'
ORDER BY ps.dsporder DESC