mysql命令通過值

Question

我有表：

posts:ID |作者|內容

我需要從一個查詢中選擇此表中的所有條目，但作者「demo」寫的帖子必須在第一個。

Answer 1

如果你想作者字段作爲第一個，那麼你必須寫

select author, id, content FROM posts ORDER BY author 

否則

select * FROM posts order by author 

Answer 2

SELECT * FROM posts 
ORDER BY CASE 
    WHEN author = 'demo' THEN posts 
END DESC 

demo

如果您想訂購別人在這裏的其他例子

：

_______________________________________________________________________________ 
|                    | 
|                    | 
|  SELECT * FROM post ORDER BY            | 
|  CASE                 | 
|  WHEN author = 'demo' THEN post1           | 
|  WHEN author = 'sdvg' THEN id           | 
|  END DESC                | 
|                    | 
|_______________________________________________________________________________| 

demo

Answer 3

我會使用一個UNION和使用預定義的值按訂單。 選擇通過演示1日所有的職位，然後那些不是由演示

SELECT id, author, content, 1 AS special FROM posts WHERE author='demo' 
UNION 
SELECT id, author, content, 0 AS special FROM posts WHERE author<>'demo' 
ORDER BY special DESC