MySQL。屬性的水平顯示

Question

是否可以水平顯示屬性。

例如，我有這樣的表：

而且簡單

SELECT user.name, project.name 
FROM user 
    LEFT JOIN project ON user.project_id = project.id; 

給我

User #1,Project #1 
User #2,Project #1 
User #3,Project #2 

是否有可能得到這樣的結果？在一個專欄名稱中以及所有相關用戶。

Project #1 
User #1 
User #2 
Project #2 
User #3 

Answer 1

我認爲你可以使用UNION查詢與一對夫婦內嵌列一起訂購的輸出產生所需的輸出。

SELECT t.name 
FROM 
(
    SELECT DISTINCT project.name AS name, 
        project.id AS id, 
        0 AS idx 
    FROM user 
    LEFT JOIN project 
     ON user.project_id = project.id 
    UNION ALL 
    SELECT user.name, 
      project.id, 
      1 
    FROM user 
    LEFT JOIN project 
     ON user.project_id = project.id 
) t 
ORDER BY t.id, 
     t.idx, 
     t.name