Question

我在laravel 5尝试加入我们，但我有一些问题希望你能帮助我，

$results = DB::table('words')
             ->join('users_words_relationship','users_words_relationship.word_id','=','words.id')
             ->where('users_words_relationship.user_id','=',Auth::user()->id)  
             ->join('translate','translate.word_id','=','words.id') 
             ->select('words.word','translate.translate')
             ->get();

此查询确实返回了重复结果

word    translation
Hello   مرحبا
Hello   اهلا وسهلا
Hello   مرحبآ
Hello   اهلا و سهلا

我试图像这样添加groupBy（）

$results = DB::table('words')
             ->join('users_words_relationship','users_words_relationship.word_id','=','words.id')
             ->where('users_words_relationship.user_id','=',Auth::user()->id)  
             ->join('translate','translate.word_id','=','words.id') 
             ->groupBy('translate.word_id')
             ->select('words.word','translate.translate')
             ->get();

它确实返回了一个结果Hello对，但并没有只有一个翻译!!

喜欢

word    translation
Hello   مرحبا

Answer 1

您正在寻找群组连接。

在Laravel中，您的查询将变为

DB::table('words')
  -> join('users_words_relationship','users_words_relationship.word_id','=','words.id')
  -> where('users_words_relationship.user_id','=',Auth::user()->id) 
  -> join('translate','translate.word_id','=','words.id')
  -> select('words.word', DB::raw('GROUP_CONCAT(DISTINCT translate.translate) as translations'))
  -> group_by('words.word')
  -> get();

Answer 2

如果您正在寻找以下输出

字词翻译

Helloمرحبا

Helloاهلاوسهلا

Helloمرحبآ

使用distinct('translate.translate')

这是查询

$results = DB::table('words')
                 ->join('users_words_relationship','users_words_relationship.word_id','=','words.id')
                 ->where('users_words_relationship.user_id','=',Auth::user()->id)  
                 ->join('translate','translate.word_id','=','words.id') 
                 ->select('words.word','translate.translate')
                 ->distinct('translate.translate')
                 ->get();

Laravel加入重复结果

2 个答案: