Question

我有在Laravel中实现的SQL查询。我的疑问是：

SELECT *  FROM officer_ranks ra
LEFT JOIN (SELECT * FROM officer_rank_details WHERE void = 0) AS r ON  ra.rank = r.present_rank
LEFT JOIN officer_languages l ON r.officer_id = l.officer_id
GROUP BY(ra.rank)
ORDER BY ra.id ASC;

为了实现这个查询，我写道：

DB::table('officer_ranks as ra')
->leftJoin(DB::raw('SELECT * FROM officer_rank_details WHERE void = 0'), 'ra.rank', '=', 'present_rank')
->leftJoin('officer_languages as l', 'officer_id', '=', 'l.officer_id')
->groupBy('ra.rank')
->get();

我的问题是如何将(DB::raw(...))结果表作为命名r因为我需要JOIN个表格。

我尝试使用

leftJoin(DB::raw('SELECT * FROM officer_rank_details WHERE void = 0') as r, 'ra.rank', '=', 'present_rank')

但它没有成功。

Answer 1

我在评论中写道如何修复你的代码。但是你原来的SQL应该是：

SELECT *  FROM officer_ranks ra
LEFT JOIN officer_rank_details AS r 
    ON  ra.rank = r.present_rank
    AND r.void  = 0
LEFT JOIN officer_languages l ON r.officer_id = l.officer_id
ORDER BY ra.id ASC;

在laravel：

DB::table('officer_ranks as ra')
    ->leftJoin('officer_rank_details as r', function($join){
       $join->on('ra.rank', '=', 'r.present_rank');
       $join->on('r.void',  '=', 0);
    })
    ->leftJoin('officer_languages as l', 'r.officer_id', '=', 'l.officer_id')
    ->get();

我还删除了GROUP BY子句，因为它使用它的方式没有意义。

Laravel Query Builder - 获取表格结果`as`

1 个答案: