how to retrieve data from multiple table using one mysql query - mysql

Question

I try to write a query in order to retrieve full info for our product in virtuemart 2.
First I try with single INNER JOIN like the example bellow:
$query ="select p.`virtuemart_product_id`, p.`product_name`, p.`product_s_desc`, `pmqbw_virtuemart_product_categories`.`virtuemart_category_id`
FROM `pmqbw_virtuemart_products_el_gr` AS p
INNER JOIN `pmqbw_virtuemart_product_categories` ON p.`virtuemart_product_id`=`pmqbw_virtuemart_product_categories`.`virtuemart_product_id`
LIMIT 0 ,10";
The above worked well!
Then I tried to be more complex and I wrote the following:
$query ="select p.`virtuemart_product_id`, p.`product_name`, p.`product_s_desc`, `pmqbw_virtuemart_product_categories`.`virtuemart_category_id`, `pmqbw_virtuemart_categories_el_gr`.`category_name`
FROM `pmqbw_virtuemart_products_el_gr` AS p
INNER JOIN p
ON `pmqbw_virtuemart_product_categories`.`virtuemart_product_id`=p.`virtuemart_product_id`
INNER JOIN `pmqbw_virtuemart_categories_el_gr` AS x
ON x.`virtuemart_category_id`=`pmqbw_virtuemart_product_categories`.`virtuemart_category_id`
LIMIT 0 ,10";
But something goes wrong here and I cannot understand.
After that I'll try to retrieve more tables and more joins in order to bring product data I need.
Thank you for your help in advance!
Actually I want to retrieve data from the following tables.
From pmqbw_virtuemart_products_el_gr I want fields: product_name, product_s_desc,virtuemart_product_id`
From pmqbw_virtuemart_product_categories I want fields: virtuemart_product_id, virtuemart_category_id
From pmqbw_virtuemart_categories_el_gr I want fields: virtuemart_category_id, category_name
From pmqbw_virtuemart_product_medias I want fields: virtuemart_product_id, virtuemart_media_id
pmqbw_virtuemart_medias I want fields: virtuemart_media_id, file_url, file_url_thumb where file_mimetype=image/jpeg AND file_type=product
I tried a different query with left joins but does not work as well.
$sql = "SELECT N.product_name,I.virtuemart_media_id,M.virtuemart_product_id,MN.category_name
FROM pmqbw_virtuemart_categories_el_gr AS M
LEFT JOIN pmqbw_virtuemart_products AS P ON P.virtuemart_product_id = M.virtuemart_product_id
LEFT JOIN pmqbw_virtuemart_products_el_gr AS N ON N.virtuemart_product_id = M.virtuemart_product_id
LEFT JOIN pmqbw_virtuemart_product_medias AS I ON I.virtuemart_product_id = M.virtuemart_product_id
LEFT JOIN pmqbw_virtuemart_product_categories AS MN ON MN.virtuemart_category_id = M.virtuemart_category_id
WHERE M.virtuemart_category_id = 1";
Any help will be appreciated!
Thank you!
Thank you all for the help!
the query that runs ok is the following:
$sql = "SELECT DISTINCT X.virtuemart_product_id, X.product_name, M.category_name, Y.virtuemart_product_id, W.file_url
FROM pmqbw_virtuemart_products_el_gr AS X
INNER JOIN pmqbw_virtuemart_product_categories AS P ON P.virtuemart_product_id = X.virtuemart_product_id
AND P.virtuemart_category_id =2
INNER JOIN pmqbw_virtuemart_categories_el_gr AS M ON M.virtuemart_category_id = P.virtuemart_category_id"
INNER JOIN pmqbw_virtuemart_product_medias AS Y ON Y.virtuemart_product_id = X.virtuemart_product_id
INNER JOIN pmqbw_virtuemart_medias AS W ON W.virtuemart_media_id = Y.virtuemart_media_id;
The bud thing is that every product has two or more images and I only want one.
I have to think something in order to eliminate it!
If anyone has something in his mind for help will be more than welcome!
Thank you!
Ok, I find a solution with GROUP BY Y.virtuemart_product_id
:)
Thank you all !