SQL左联接-合并具有相同ID的数组

Question

I'm writing a MySQL query (with laravel Query Builder) with multiple LEFT JOIN. In the result the array I get looks like:

    array:4 [▼
  0 => {#322 ▼
    +"id": 19
    +"thing_id": 7
    +"title": "new translate"
    +"locale": "en"
    +"thing_sub_cat_id": 19
    +"name": "WINTER"
  }
  1 => {#323 ▼
    +"id": 24
    +"thing_id": 7
    +"title": "new translate"
    +"locale": "en"
    +"thing_sub_cat_id": 24
    +"name": "DIVING"
  }
  2 => {#324 ▼
    +"id": 37
    +"thing_id": 15
    +"title": "thing to do"
    +"locale": "en"
    +"thing_sub_cat_id": 37
    +"name": "LATEST HAPPENINGS"
  }
  3 => {#325 ▼
    +"id": 21
    +"thing_id": 2
    +"title": "Main page"
    +"locale": null
    +"thing_sub_cat_id": null
    +"name": null
  }
]

Query Builder :

DB::table('things_translations')
                            ->leftjoin('things_sub_cat_rel', 'things_sub_cat_rel.thing_id', '=', 'things_translations.thing_id')
                            ->leftjoin('things_sub_cat_translations', 'things_sub_cat_rel.thing_sub_cat_id', '=', 'things_sub_cat_translations.thing_sub_cat_id')
                            ->where('things_translations.locale', '=', 'en')
                            ->get();

The locale column associate with laravel-translatable package. I'm trying to get all rows of database that has locale=en . I'd use laravel eloquent but I got unknown column locale so I've tried the query builder above.

Associated models :

ThingTranslation that has belongsToMany relation with ThingSubCat . For example let's say that I have 3 tables 1 for articles 1 for categories and 1 for relation that has the articleID and categoryID.

I would like to know the better way to combine arrays that has the same "thing_id". For example above I have two arrays with the thing_id: 7. Can I combine these two arrays to one using mysql and for the "name" to have multiple arrays with it's value ?

Answer 1

I think you should use GROUP_CONCAT function in mysql like this :

SELECT tbl.*,
    GROUP_CONCAT(`name` SEPERATOR ',') as `name_combined`
    FROM
(
  SELECT * FROM things_translations
  LEFT JOIN things_sub_cat_rel ON things_sub_cat_rel.thing_id = things_translations.thing_id
  LEFT JOIN things_sub_cat_translations ON things_sub_cat_rel.thing_sub_cat_id = things_sub_cat_translations.thing_sub_cat_id
  WHERE things_translations.locale = 'en'
) tbl
GROUP BY things_id; 

With a query like this you combine name in rows that their thing_id are alike into one row.

Syntax Reference :

http://dev.mysql.com/doc/refman/5.7/en/group-by-functions.html#function_group-concat

Answer 2

*If someone has the same problem with laravel he can look at my answers below. If someone has similar problem, he can try with the query in the answer of Ramin Omrani. It works perfect.

I've found the solution with laravel eloquent. The problem it was because I'm using laravel-translatable package. And the only way to take the rows that has locale = "en" is using the whereHas translations and then with where clause like the code bellow:

$getThing = Thing::with('subCategories')->whereHas('translations', function ($query) {
    $query->where('locale', '=', 'en');
})->get();