Question

我有三张桌子

用户＆gt; id, username, name, age, sex, location
用户帖子＆gt; id, user_id, description, image, postime, location
关注＆gt; id, user_id, follow_id, status

在用户表中，我将获得所有用户信息。

在“用户帖子”表格中，我将获得所有与帖子相关的信息。

我想显示自己的帖子以及我关注的用户的帖子

我为这种情况编写的查询是

SELECT 
  u.username,
  u.name,
  u.profile_pic, 
  up.* 
 FROM user u, user_post up 
 WHERE (up.user_id  = $user_id OR up.user_id IN 
       (SELECT user_id 
        FROM follow WHERE follow_id=$user_id)), $user_id) 
        AND description='' group by id order by postime desc

我觉得查询错了，任何人都可以帮助我

CREATE TABLE IF NOT EXISTS `user` (
  `id` int(10) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) NOT NULL,
  `username` varchar(30) NOT NULL,
  `password` varchar(1000) NOT NULL,
  `email` varchar(100) NOT NULL,
  `age` varchar(100) NOT NULL,
  `gender` varchar(100) NOT NULL,
  `city` varchar(100) NOT NULL,
  `state` varchar(100) NOT NULL,
  `country` varchar(100) NOT NULL,
  `profile_pic` varchar(100) NOT NULL,
  `deviceToken` char(64) DEFAULT NULL,
  PRIMARY KEY (`id`)
)

CREATE TABLE IF NOT EXISTS `user_post` (
  `id` int(10) NOT NULL AUTO_INCREMENT,
  `description` varchar(100) NOT NULL,
  `image` varchar(100) NOT NULL,
  `location` varchar(100) NOT NULL,
  `postime` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `user_id` int(20) NOT NULL,
  PRIMARY KEY (`id`)
)

CREATE TABLE IF NOT EXISTS `follow` (
  `id` int(100) NOT NULL AUTO_INCREMENT,
  `user_id` int(100) NOT NULL,
  `follow_id` int(100) NOT NULL,
  `date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `status` varchar(20) NOT NULL DEFAULT 'Pending',
  PRIMARY KEY (`id`)
)

Answer 1

这与我昨天发布的答案相同：

SELECT u.username,u.name,u.profile_pic, up.* 
FROM user u JOIN user_post up 
  ON up.user_id = u.id
WHERE 
   (up.user_id  = $user_id 
    OR
    up.user_id IN (
                     SELECT user_id 
                     FROM follow 
                     WHERE follow_id=$user_id
                   )
   )
AND description='' 
ORDER BY postime DESC

由于您没有说明用户与关注者之间的关系，因此可能需要切换follow_id和user_id：

SELECT u.username,u.name,u.profile_pic, up.* 
FROM user u JOIN user_post up 
  ON up.user_id = u.id
WHERE 
   (up.user_id  = $user_id 
    OR
    up.user_id IN (
                     SELECT follow_id
                     FROM follow 
                     WHERE user_id=$user_id
                   )
   )
AND description='' 
ORDER BY postime DESC

查询我正在关注的用户的所有帖子和我自己的帖子

1 个答案: