Laravel / Mysql群订购

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

我将返回由created_at添加的最后一集的系列。但问题是，当我让它托管所有的工作，但现在，我把它放在VPS服务器，在那里，我总是列出第一集。如果我在desc后面加上group by serial_id，这是工作，但在laravel (-> groupBy ('serial_id'))上是不可能的。

共享托管：

+---------+-------------+--------+
| 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 |
+---------+-------------+--------+

预先感谢您的帮助

Answer 1

在本例中，您可能需要使用RAW：groupBy(DB::raw('serial_id desc'))

就像下面

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

好像你的查询中有很多错误。

在FROM和ORDER BY之间缺少一个表名

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

试着做这样的事情：

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中，您可以使用以下方法指定订单方向：

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