将两个查询合并为一个

Question

我有两个我想合并为一个的查询。

第一个看起来像这样;

SELECT t.name, 
     t.score, 
     COUNT(m.user_id) AS memberCount 
     FROM team AS t, team_member AS m 
     WHERE t.team_id = '$id' AND m.team_id = '$id' 

第二个看起来像这样;

SELECT COUNT(t.team_id) AS rank 
     FROM team AS t 
     WHERE t.score > (SELECT t.score 
           FROM team AS t 
           WHERE t.team_id = '$id') 

我怀疑JOIN会成为解决方案的一部分，我只是不知道如何。 任何想法赞赏。

Answer 1

你可以，例如，插入你的第二个查询有权选择第一个条款：

SELECT 
    t.name, 
    t.score, 
    (SELECT 
    COUNT(t.team_id) AS rank 
    FROM 
    team AS t 
    WHERE 
    t.score > (SELECT t.score FROM team AS t WHERE t.team_id = '$id') 
) as rank, 
    COUNT(m.user_id) AS memberCount 
FROM 
    team AS t, team_member AS m 
WHERE 
    t.team_id = '$id' AND m.team_id = '$id' 

Answer 2

您可以使用UNION：

SELECT t.name, 
    t.score, 
    COUNT(m.user_id) AS memberCount 
    FROM team AS t, team_member AS m 
    WHERE t.team_id = '$id' AND m.team_id = '$id' 
UNION 
SELECT COUNT(t.team_id) AS rank 
    FROM team AS t 
    WHERE t.score > (SELECT t.score 
          FROM team AS t 
          WHERE t.team_id = '$id')