gistfile1.sql

SELECT
    CONCAT(
        'UPDATE wp_posts SET post_content = REPLACE(post_content, ' ,
        QUOTE(meta.meta_value) , ', ' ,
        QUOTE(post.guid) , ');'
    )
FROM
    wp_posts AS post
        RIGHT JOIN
    wp_postmeta AS meta
        ON
            post.ID = meta.post_id
                AND
            meta.meta_key = '_import_url'
WHERE
    post.guid != '';