Как составить многотабличный запрос без повторений?

Есть две таблици:

CREATE TABLE IF NOT EXISTS posts
(	
	id int(10) PRIMARY KEY NOT NULL AUTO_INCREMENT,
    username VARCHAR(128) NOT NULL,
    title VARCHAR(128) NOT NULL UNIQUE,
    `text` VARCHAR(1000) NOT NULL,
    slug VARCHAR(128) NOT NULL UNIQUE,
    created_at DATE NOT NULL
);

CREATE TABLE IF NOT EXISTS comments
(	
	id int (10) PRIMARY KEY NOT NULL AUTO_INCREMENT,
    username VARCHAR(128) NOT NULL,
    `text` VARCHAR(1000) NOT NULL,
    postId INT,
    created_at DATE NOT NULL,
    CONSTRAINT post_id_fk
    FOREIGN KEY (postId) REFERENCES posts (id)
);

Есть запрос:

SELECT t1.id as postId, t1.username as postUsername, t1.title as postTitle, t1.`text` as postText, t1.slug as postSlug, t1.created_at as postCreatedAt, t2.username as commentUsername, t2.`text` as commentText, t2.postId, t2.created_at as commentCreatedAt FROM posts as t1 LEFT JOIN comments as t2 ON t1.id = t2.postId WHERE t1.slug = 'Come_with_me_if_you_wanna_live';

Результат:

Нужно получить пост и все его коменты, пост приходит несколько раз. Как избавиться от повторений?