Hey guys.. I made this SQL query which selects post Ids by all posts containing a keyword then attempts to add a custom field but I get a syntax error.

Bit lost so all help appreciated thanks.

Code:
INSERT INTO wp_postmeta (post_id, meta_key, meta_value)
SELECT ID FROM wp_posts WHERE post_content LIKE '%Customer Reviews%' AS post_id,
       'customer_reviews' AS meta_key, 
       'On_or_delete' AS meta_value
FROM   wp_posts 
WHERE  ID NOT IN
       (SELECT post_id 
        FROM wp_postmeta 
        WHERE meta_key = 'customer_reviews')
       AND post_type = 'post';