Delete empty Woocommerce SKU

delete_empty_sku.sql

       DELETE wp_posts, 
       		  wp_postmeta,
       		  wp_comments,
       		  wp_commentmeta

         FROM wp_posts

	LEFT JOIN wp_postmeta
		   ON wp_postmeta.post_id = wp_posts.ID
          AND wp_postmeta.meta_key = '_sku'

    LEFT JOIN wp_comments
           ON wp_comments.comment_post_ID = wp_posts.ID

    LEFT JOIN wp_commentmeta
           ON wp_commentmeta.comment_id = wp_comments.comment_ID

    LEFT JOIN wp_postmeta wpm2
           ON wpm2.post_id = wp_posts.ID

		WHERE wp_posts.post_type = 'product'
  		  AND (wp_postmeta.meta_value= '' OR wp_postmeta.meta_value IS NULL)