Question

我想使用Laravel查询构建器重现以下mySQL查询：

*SELECT SUM(scores) FROM (SELECT scores FROM player_games WHERE player_id = 1 ORDER BY id DESC LIMIT 2) scores

有什么建议吗？

解决方法：

    $sub = playerGame::where('player_id',1)->where('scores','>',0)->limit(2)->orderBy('id','desc');

    $count = DB::table( DB::raw("({$sub->toSql()}) as sub") )
   ->mergeBindings($sub->getQuery()) 
   ->sum('scores');
   return $count;

Answer 1

$responce= DB::table('player_games')->where('player_id',1)->sum('amount');
        dd(collect($responce)->sortByDesc('id')->take(2));

请仔细检查一下这个.....我尝试它的工作....并在控制器顶部添加use DB; ...

Answer 2

使用fromSub()：

$sub = playerGame::select('scores')
    ->where('player_id', 1)
    ->where('scores', '>', 0)
    ->limit(2)
    ->orderBy('id','desc');
$sum = DB::query()->fromSub($sub, 'scores')->sum('scores');

Laravel 5.6：如何使用查询生成器创建子查询

2 个答案: