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How to delete from select in MySQL?
Using Mysql query you can use join in delete query
DELETE p.*,w.* FROM `wp_postmeta` w JOIN wp_posts p ON(p.ID = w.`post_id`) WHERE w.`meta_key` LIKE 'acest_meta'
Above query will delete all posts and its meta data contains a meta_key as acest_meta
you can delete with a select using an IN() statement and put the select in an IN like so
DELETE FROM `wp_postmeta` WHERE `post_id` IN ( SELECT `post_id` FROM `wp_postmeta` WHERE `meta_key` LIKE 'acest_meta' )
delete from wp_postmeta where post_id in (SELECT post_id FROM wp_postmeta WHERE meta_key = 'acest_meta')