set-cover-image.sql

## https://forum.shopware.com/t/bild-als-cover-setzen-bei-mehrfachaenderung/96122/14
## set cover image
UPDATE
    product p
        LEFT JOIN product_media pm ON (p.id = pm.product_id AND p.version_id = pm.product_version_id AND pm.position = (
        SELECT
            min(position)
        FROM
            product_media
        WHERE
            product_id = p.id AND product_version_id = p.version_id))
        LEFT JOIN product AS pp ON (p.parent_id = pp.id AND p.parent_version_id = pp.version_id)
        LEFT JOIN product_media ppm ON (pp.id = ppm.product_id AND pp.version_id = ppm.product_version_id AND ppm.position = (
        SELECT
            min(position)
        FROM
            product_media
        WHERE
            product_id = pp.id AND product_version_id = pp.version_id))
SET p.product_media_id = IF(pm.id IS NOT NULL, pm.id, ppm.id), p.cover = IF(pm.id IS NOT NULL, pm.id, ppm.id);