Laravel/MySQL的GROUPBY訂貨

Question

我有命令

SELECT * FROM 
    (SELECT * FROM episodes ORDER BY created_at DESC) and t1 
GROUP BY serial_id 
ORDER BY created_at DESC 

，我將回到那裏通過created_at添加的最後一集系列。但問題是，當我把它放在託管所有工作，但現在我把它放在VPS服務器上，我總是列出第一集。如果我group by serial_id之後添加desc它的工作，但它是不可能在laravel（-> groupBy ('serial_id')）

共享主機：

+---------+-------------+--------+ 
| id  | serial_id | part | 
+---------+-------------+--------+ 
| 8124 | 12   | s02e10 | 
|  362 | 8   | s09e12 | 
| 4673 | 9   | s01e12 | 
|  871 | 4   | s03e24 | 
+---------+-------------+--------+ 

我的VPS：

+---------+-------------+--------+ 
| id  | serial_id | part | 
+---------+-------------+--------+ 
| 8124 | 12   | s01e01 | 
|  362 | 8   | s01e01 | 
| 4673 | 9   | s01e01 | 
|  871 | 4   | s01e01 | 
+---------+-------------+--------+ 

預先感謝您的幫助

Answer 1

也許你會在這種情況下必須使用RAW：groupBy(DB::raw('serial_id desc'))

像下面

DB::table(DB::raw("(SELECT * FROM episodes ORDER BY created_at DESC) and t1"))->groupBy(DB::raw('serial_id desc'))->orderBy('created_at', 'desc')->get(); 

Answer 2

似乎你的查詢中有很多錯誤。

失蹤FROM和ORDER BY之間的表名

SELECT * FROM (SELECT * FROM 
--       ^^ where is the tablename ? 

ORDER BY episodes created_at DESC) and t1 GROUP BY ORDER BY serial_id created_at DESC 
--    ^^ missing comma, ^^ this 'and' seems in the wrong place and you havent't column for group by and in last another missing comma 

嘗試這樣的事：

SELECT * FROM (SELECT * 
      FROM my_table ORDER BY episodes, created_at DESC) t1 
GROUP BY my_column_for_group_by 
ORDER BY serial_id, created_at DESC 

在laravel你可以使用分配順序方向：

->orderBy('serial_id') 
->orderBy('created_at', 'DESC')