mysql - 結果を結合し、コンマで区切る

Question

私はこのクエリを持っています:

SELECT
  tud.detail_company_name AS company_name,
  tud.detail_country AS company_country,
  trv.review_title AS review_title
FROM users_detail tud
INNER JOIN users_auth tua
  ON tud.user_id = tua.user_id
LEFT JOIN reviews trv
  ON tud.user_id = trv.review_company_id
WHERE
  tua.auth_user_type = "company" OR tua.auth_user_type = "guestcompany"

クエリは正常に機能し、次のような結果が返されます。

Array
(
    [0] => Array
        (
            [company_name] => The Coffee Brewery
            [company_country] => US
            [review_title] => 
        )
    [1] => Array
        (
            [company_name] => Crea Nail Art Studio
            [company_country] => SG
            [review_title] => 
        )
    [2] => Array
        (
            [company_name] => Hello Mall
            [company_country] => JP
            [review_title] => Fake goods!
        )
    [3] => Array
        (
            [company_name] => Hello Mall
            [company_country] => JP
            [review_title] => Never buy in there!
        )
)

お気づきのように、配列キー 2 と 3 のcompany_nameは同じですが、 review_titleは異なります。1 つの結果に結合し、コンマで区切る必要がある可能性はありますか? たとえば、次の結果を言います。

Array
(
    [0] => Array
        (
            [company_name] => The Coffee Brewery
            [company_country] => US
            [review_title] => 
        )
    [1] => Array
        (
            [company_name] => Crea Nail Art Studio
            [company_country] => SG
            [review_title] => 
        )
    [2] => Array
        (
            [company_name] => Hello Mall
            [company_country] => JP
            [review_title] => Fake goods!, Never buy in there!
        )
)

編集

応答が次の場合はどうなりますか。

Array
(
    [0] => Array
        (
            [company_name] => The Coffee Brewery
            [company_country] => US
            [review_title] => 
            [review_approved] =>
        )
    [1] => Array
        (
            [company_name] => Crea Nail Art Studio
            [company_country] => SG
            [review_title] => 
            [review_approved] =>
        )
    [2] => Array
        (
            [company_name] => Hello Mall
            [company_country] => JP
            [review_title] => Fake goods!
            [review_approved] => 1
        )
    [3] => Array
        (
            [company_name] => Hello Mall
            [company_country] => JP
            [review_title] => Never buy in there!
            [review_approved] => 0
        )
)

review_titleに0のreview_approved を含めないようにするにはどうすればよいGROUP_CONCATですか? それで、このように出力されますか？

Array
(
    [0] => Array
        (
            [company_name] => The Coffee Brewery
            [company_country] => US
            [review_title] => 
        )
    [1] => Array
        (
            [company_name] => Crea Nail Art Studio
            [company_country] => SG
            [review_title] => 
        )
    [2] => Array
        (
            [company_name] => Hello Mall
            [company_country] => JP
            [review_title] => Fake goods!
        )
)