[英]How to get comments and the comments' replies out of table
我有一个评论表。
我想从表中获取评论和回复以显示它们。 我只是在寻找一个查询,所以我可以做这样的事情
我所做的查询
SELECT c.post_id, c.id AS comment_id, c.user_id, users.username, c.created, c.comment, r.id AS reply_id, r.parent_comment_id, r.created, r.comment AS reply, r.user_id AS reply_user_id, r_user.username as reply_username FROM (comments c) LEFT JOIN comments r ON c.id = r.parent_comment_id LEFT JOIN users ON c.user_id = users.id LEFT JOIN users as r_user ON r.user_id = r_user.id WHERE r.id OR c.post_id IS NOT NULL ORDER BY parent_comment_id ASC;
也许是这样的:
SELECT
c.comment,
IFNULL(r.comment, '') reply
FROM
comments c
LEFT JOIN comments r
ON c.id = r.parent_comment_id
WHERE
c.parent_comment_id is null
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