sql - SQLフィルター多対多の関係

Question

私は次のテーブルを持っています

competitions
id prize
1 win a car
2 win an ipod

competition_type
competition_id Type_id
  1              1
  1              2
  2              1

Type
id   type
1    facebook
2    twitter

フェイスブックであるがツイッターではないすべてのコンテストを選択するにはどうすればよいですか。だから私は最終結果としてiPodを獲得する必要がありますか？

Answer 1

この例を見てください

select * from Competitions as c
left join competition_type as ct
on c.id = ct.competition_id
left join Type as t
on t.id = ct.Type_id
where t.Type <> 'Twitter'
;

結果：

ID  PRIZE         COMPETITION_ID    TYPE_ID     TYPE
1   win a car     1                 1           facebook
2   win an ipod   2                 1           facebook

**<>で更新 Twitter

SQLFIDDLEリファレンス

Answer 2

クエリはどうですか？

Select Prize from 
Competitions a inner join competition_type b on a.id=b.competition_id
    inner join Type c on b.Type_id=c.id
Where c.Type='facebook' and c.Type<>'twitter'

Answer 3

SELECT
    ct.competition_id FROM
    competitions c
JOIN competition_type ct ON ct.competition_id = c.id AND ct.Type_id = 1 
WHERE
    NOT EXISTS(SELECT * FROM competitions c2 
                     JOIN competition_type ct2 
                     ON ct2.competition_id = c2.id AND ct2.Type_id = 2 
                     WHERE c2.id = c.id)

Answer 4

これを試して -

select cmp.id, cmp.prize from 
competitions cmp inner join competition_type ct on cmp.id = ct.competition_id
inner join Type t on t.id = ct.type_id
where t.type = 'facebook'

Answer 5

SELECT  a.*
FROM    competition a
WHERE   a.id NOT IN
(
    SELECT  b.competition_id
    FROM    competition_type b 
            INNER JOIN Type c
                ON b.type_ID = c.id
    WHERE   c.type = 'twitter'
)

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