MySQL Update a table on these arrays? - mysql

Question

I have a query like so:
SELECT DISTINCT(wp.`ID`), wps.sku AS sku
FROM `wp_posts` AS wp
INNER JOIN `wp_postmeta` AS wpm ON (wpm.`post_id` = wp.`ID` AND wpm.`meta_key` = '_sku' AND wpm.`meta_value` = '')
INNER JOIN `wp_product_skus` AS wps ON (wps.`id_product` = wpm.`post_id`)
WHERE wp.`post_parent` = 0 AND wp.`post_type` = 'product' AND wp.`ID` NOT IN (SELECT post_parent FROM wp_posts WHERE post_parent != 0 AND post_type = 'product_variation')
It returns output like so:
I need to perform an UPDATE on all IDs that match in the wp_postmeta table with the post_id = ID and update the meta_value of sku with the value of the sku from the above pic.
How can I do this all from within a MySQL Query?

Answer 1

You want to perform a UPDATE with JOIN to other tables as needed like
UPDATE `wp_posts` wp
INNER JOIN `wp_postmeta` wpm ON wpm.`post_id` = wp.`ID`
AND wpm.`meta_key` = '_sku'
AND wpm.`meta_value` = ''
INNER JOIN `wp_product_skus` wps ON wps.`id_product` = wpm.`post_id`
WHERE wp.`post_parent` = 0
AND wp.`post_type` = 'product'
AND wp.`ID` NOT IN (
SELECT post_parent FROM wp_posts
WHERE post_parent != 0
AND post_type = 'product_variation'
)
SET wp.sku = wps.sku
(OR) By directly joining with your SELECT result set like below
UPDATE `wp_posts` wp
JOIN
(
SELECT DISTINCT wp.`ID`,
wps.sku AS sku
FROM `wp_posts` wp
INNER JOIN `wp_postmeta` AS wpm ON wpm.`post_id` = wp.`ID`
AND wpm.`meta_key` = '_sku'
AND wpm.`meta_value` = ''
INNER JOIN `wp_product_skus` wps ON wps.`id_product` = wpm.`post_id`
WHERE wp.`post_parent` = 0
AND wp.`post_type` = 'product'
AND wp.`ID` NOT IN (
SELECT post_parent FROM wp_posts
WHERE post_parent != 0
AND post_type = 'product_variation')
) TAB ON wp.ID = TAB.ID
SET wp.sku = TAB.sku