mysql - 选择 "all"同时在mysql中选择 "individually"

coder 2023-10-20 原文

我有三个简单的表:users、profile 和 watched，其中包含用户的 ID 和他们观看的电影标题。

下面的脚本显示了表watched中不同用户的匹配值:

$id = $_SESSION['id'];
echo "my id: $id\n";

$movies = mysqli_query($connect, "SELECT w1.users_id AS user1, 
                                         w2.users_id AS user2, 
                                         COUNT(w2.watched) AS num_movies, 
                                         GROUP_CONCAT(w2.watched ORDER BY w2.watched) AS movies
                                  FROM watched w1
                                  JOIN watched w2 ON w2.watched = w1.watched AND w2.users_id != w1.users_id
                                  WHERE w1.users_id = $id
                                  GROUP BY user1, user2");
while ($row = $movies->fetch_assoc()) {
    echo "matched with id {$row['user2']} {$row['num_movies']} times on titles {$row['movies']}\n";
}

输出:

my id = `1`;
matched with id `2` 2 times on titles `movie2`, `movie1`;
matched with id `3` 1 times on titles `movie1`;

demo on fiddle

但我想还显示用户的姓名、个人资料等。就像在这个查询中:SELECT * FROM profile INNER JOIN users ON profile.users_id = users.id

如何合并第一个和第二个查询？

尝试过:

SELECT *, w2.watched, 
COUNT(w2.watched) AS num_movies, 
GROUP_CONCAT(w2.watched order by w2.watched) as movies

FROM profile AS p 
JOIN users AS u ON p.users_id = u.id 
LEFT JOIN watched AS w ON w.users_id = u.id and w.watched=w2.watched
     WHERE u.id != $id
     GROUP BY w.users_id

但它不起作用。

最佳答案

试试这个

    SELECT w1.users_id AS user1,u.name as name, p.*, u.*, w2.users_id 
    AS user2, COUNT(w2.watched) AS num_movies, 
    GROUP_CONCAT(w2.watched ORDER BY w2.watched) AS movies 
    FROM watched w1 
    JOIN watched w2 ON w2.watched = w1.watched 
    AND w2.users_id != w1.users_id 
    JOIN users u ON u.id=w1.users_id 
    JOIN profile p ON p.users_id=w1.users_id 
    WHERE w1.users_id =1 GROUP BY user1, user2

输出

关于mysql - 选择 "all"同时在mysql中选择 "individually"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55035072/

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mysql - 选择 "all"同时在mysql中选择 "individually"

有关mysql - 选择 "all"同时在mysql中选择 "individually"的更多相关文章

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