SELECT id, post_id, author_id, author_name, content, created_at FROM comment WHERE post_id = #{postId} ORDER BY id ASC SELECT id, post_id, author_id, author_name, content, created_at FROM comment WHERE id = #{id} INSERT INTO comment (post_id, author_id, author_name, content, created_at) VALUES (#{postId}, #{authorId}, #{authorName}, #{content}, NOW()) DELETE FROM comment WHERE id = #{id} DELETE FROM comment WHERE post_id = #{postId}