OrderBy 子句不适用于 Microsoft SQL？

Question

我最近试图在我的 Laravel 网络应用程序上将我的数据库从 MariaDB 更改为 SQL 服务器（不幸的是不是我的电话）。但是，当我运行并打开其中一个页面时，我收到了错误消息：

SQLSTATE[42000]: [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]
The ORDER BY clause is invalid in views, inline functions, derived tables, subqueries, and common table expressions, unless TOP, OFFSET or FOR XML is also specified.

还有这个：

SELECT COUNT(*) AS aggregate
FROM [items]
     INNER JOIN (SELECT [model_name],
                        MAX(version) AS max_version
                 FROM [items]
                 WHERE [items].[deleted_at] IS NULL
                 GROUP BY [model_name]
                 ORDER by [created_at] ASC) [max_version_table] ON [items].[model_name] = [max_version_table].[model_name]
                                                              AND [items].[version] = [max_version_table].[max_version]
WHERE [items].[deleted_at] IS NULL;

我是 SQL 的新手，这是我的 Eloquent ORM 代码：

public function AllModel(){
    $max_version_table = Item::select('model_name', DB::raw('MAX(version) as max_version'))->orderBy('created_at')->groupBy('model_name');

    $items = Item::select('*')->joinSub($max_version_table, 'max_version_table', function($join){
    $join->on('items.model_name','=','max_version_table.model_name');
    $join->on('items.version','=','max_version_table.max_version');
    })->paginate(5);    //Shows max version of each model name

    return view('admin.item.index',compact('items'));
}

我的理解是 MSSql 不支持 OrderBy，因为它在 MariaDB 上运行得很好。如果可以，请问我可以用它换什么？感谢任何帮助

Answer 1

SQL 服务器绝对支持 ORDER BY，但您的查询应该类似于

select count(*) as aggregate 
from [items] 
inner join 
(
  select [model_name], MAX(version) as max_version from [items] where [items].      [deleted_at] is null group by [model_name] 
) as [max_version_table] 
on 
 [items].[model_name] = [max_version_table].[model_name] 
    and [items].[version] = [max_version_table].[max_version] 
where [items].[deleted_at] is null

Answer 2

MSSQL 肯定支持 order by 但在你的情况下，错误已经提示

The ORDER BY clause is invalid in views, inline functions, derived tables, subqueries, and common table expressions

您不能像以前那样在 subqueries 中使用 order by。浏览 mssql order by documentation 以获得更多理解

通过查看您的查询，我认为没有必要添加任何 order by，因为它什么都不做。您可以删除该子句。

SELECT count(*) AS AGGREGATE
FROM [items]
INNER JOIN
  (SELECT [model_name],
          MAX(VERSION) AS max_version
   FROM [items]
   WHERE [items].[deleted_at] IS NULL
   GROUP BY [model_name]
) AS [max_version_table] ON [items].[model_name] = [max_version_table].[model_name]
AND [items].[version] = [max_version_table].[max_version]
WHERE [items].[deleted_at] IS NULL

OrderBy 子句不适用于 Microsoft SQL？

OrderBy clause not working on Microsoft SQL?

php

sql

sql-server

laravel

eloquent