选择联接表中不符合某些条件的所有记录

SELECT *
FROM posts p
WHERE NOT EXISTS(
    SELECT 1
    FROM comments c
    WHERE c.comment_date >= 'deadline'
    AND p.post_id = c.post_id
)

SELECT  *
FROM    posts
WHERE   post_id NOT IN 
        (
        SELECT  comment_post
        FROM    comments
        WHERE   comment_date >= @deadline
        )