sql - カンマ区切りリストとしての MySQL 結果

Question

次のようなクエリを実行する必要があります。

SELECT p.id, p.name, 
       (SELECT name 
          FROM sites s 
         WHERE s.id = p.site_id) AS site_list
  FROM publications p

しかし、副選択で、データの列ではなく、カンマ区切りのリストを返すようにしたいと思います。これは可能ですか？

Answer 1

GROUP_CONCATを使用してそれを実行できます。

SELECT p.id, p.name, GROUP_CONCAT(s.name) AS site_list
FROM sites s
INNER JOIN publications p ON(s.id = p.site_id)
GROUP BY p.id, p.name;

Answer 2

今、私だけがこの状況に遭遇し、 の周りにいくつかの興味深い機能を見つけましGROUP_CONCATた. これらの詳細が興味深いと感じていただければ幸いです。

単純な GROUP_CONCAT

SELECT GROUP_CONCAT(TaskName) 
FROM Tasks;

結果：

+------------------------------------------------------------------+
| GROUP_CONCAT(TaskName)                                           |
+------------------------------------------------------------------+
| Do garden,Feed cats,Paint roof,Take dog for walk,Relax,Feed cats |
+------------------------------------------------------------------+

DISTINCT を使用した GROUP_CONCAT

SELECT GROUP_CONCAT(TaskName) 
FROM Tasks;

結果：

+------------------------------------------------------------------+
| GROUP_CONCAT(TaskName)                                           |
+------------------------------------------------------------------+
| Do garden,Feed cats,Paint roof,Take dog for walk,Relax,Feed cats |
+------------------------------------------------------------------+

DISTINCT および ORDER BY を使用した GROUP_CONCAT

SELECT GROUP_CONCAT(DISTINCT TaskName ORDER BY TaskName DESC) 
FROM Tasks;

結果：

+--------------------------------------------------------+
| GROUP_CONCAT(DISTINCT TaskName ORDER BY TaskName DESC) |
+--------------------------------------------------------+
| Take dog for walk,Relax,Paint roof,Feed cats,Do garden |
+--------------------------------------------------------+

DISTINCT および SEPARATOR を使用した GROUP_CONCAT

SELECT GROUP_CONCAT(DISTINCT TaskName SEPARATOR ' + ') 
FROM Tasks;

結果：

+----------------------------------------------------------------+
| GROUP_CONCAT(DISTINCT TaskName SEPARATOR ' + ')                |
+----------------------------------------------------------------+
| Do garden + Feed cats + Paint roof + Relax + Take dog for walk |
+----------------------------------------------------------------+

GROUP_CONCAT と列の結合

SELECT GROUP_CONCAT(TaskId, ') ', TaskName SEPARATOR ' ') 
FROM Tasks;

結果：

+------------------------------------------------------------------------------------+
| GROUP_CONCAT(TaskId, ') ', TaskName SEPARATOR ' ')                                 |
+------------------------------------------------------------------------------------+
| 1) Do garden 2) Feed cats 3) Paint roof 4) Take dog for walk 5) Relax 6) Feed cats |
+------------------------------------------------------------------------------------+

GROUP_CONCAT とグループ化 された結果GROUP_CONCAT

+------------------------+--------------------------+
| ArtistName             | AlbumName                |
+------------------------+--------------------------+
| Iron Maiden            | Powerslave               |
| AC/DC                  | Powerage                 |
| Jim Reeves             | Singing Down the Lane    |
| Devin Townsend         | Ziltoid the Omniscient   |
| Devin Townsend         | Casualties of Cool       |
| Devin Townsend         | Epicloud                 |
| Iron Maiden            | Somewhere in Time        |
| Iron Maiden            | Piece of Mind            |
| Iron Maiden            | Killers                  |
| Iron Maiden            | No Prayer for the Dying  |
| The Script             | No Sound Without Silence |
| Buddy Rich             | Big Swing Face           |
| Michael Learns to Rock | Blue Night               |
| Michael Learns to Rock | Eternity                 |
| Michael Learns to Rock | Scandinavia              |
| Tom Jones              | Long Lost Suitcase       |
| Tom Jones              | Praise and Blame         |
| Tom Jones              | Along Came Jones         |
| Allan Holdsworth       | All Night Wrong          |
| Allan Holdsworth       | The Sixteen Men of Tain  |
+------------------------+--------------------------+

USE Music;
SELECT ar.ArtistName,
    GROUP_CONCAT(al.AlbumName)
FROM Artists ar
INNER JOIN Albums al
ON ar.ArtistId = al.ArtistId
GROUP BY ArtistName;

結果：

+------------------------+----------------------------------------------------------------------------+
| ArtistName             | GROUP_CONCAT(al.AlbumName)                                                 |
+------------------------+----------------------------------------------------------------------------+
| AC/DC                  | Powerage                                                                   |
| Allan Holdsworth       | All Night Wrong,The Sixteen Men of Tain                                    |
| Buddy Rich             | Big Swing Face                                                             |
| Devin Townsend         | Epicloud,Ziltoid the Omniscient,Casualties of Cool                         |
| Iron Maiden            | Somewhere in Time,Piece of Mind,Powerslave,Killers,No Prayer for the Dying |
| Jim Reeves             | Singing Down the Lane                                                      |
| Michael Learns to Rock | Eternity,Scandinavia,Blue Night                                            |
| The Script             | No Sound Without Silence                                                   |
| Tom Jones              | Long Lost Suitcase,Praise and Blame,Along Came Jones                       |
+------------------------+----------------------------------------------------------------------------+

Answer 3

を使用する代わりに、group concat()単に使用できますconcat()

Select concat(Col1, ',', Col2) as Foo_Bar from Table1;

編集 これは mySQL でのみ機能します。Oracle concat は 2 つの引数のみを受け入れます。オラクルでは、select col1||','||col2||','||col3 as foobar from table1; のようなものを使用できます。SQL Server では、パイプの代わりに + を使用します。