[英]MySQL sort of union
我有3張桌子:
CREATE TABLE IF NOT EXISTS `Articles` (
`id` int(11) NOT NULL DEFAULT '',
...
...
PRIMARY KEY (`id_article`)
) ENGINE=InnoDB ;
人物文章:
CREATE TABLE IF NOT EXISTS `Persons_Articles` (
`id_article` int(11) NOT NULL,
`id_person` int(11) UNSIGNED NOT NULL,
`role` TINYINT(4) UNSIGNED,
PRIMARY KEY (`id_article`,`id_person`,`role`)
) ENGINE=InnoDB ;
人數:
CREATE TABLE IF NOT EXISTS `Persons` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`firstname` varchar(64) DEFAULT NULL,
`lastname` varchar(64) NOT NULL,
`fullname` varchar(128) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB ;
INSERT INTO Articles VALUES (1, 'A'), (2, 'B'), (3, 'B');
INSERT INTO Persons_Articles VALUES (1, 1, 1);
INSERT INTO Persons_Articles VALUES (1, 2, 2);
INSERT INTO Persons VALUES (1, 'Mick', 'Jagger', 'Mick Jagger');
INSERT INTO Persons VALUES (2, 'Keith', 'Richards', 'Keith Richards');
我正在尋找一個查詢,該查詢可以返回帶有(fullname ='Mick Jagger'AND角色= 1)和(fullname ='Keith Richards'AND角色= 2)的文章
有任何想法嗎 ?
嘗試執行以下操作:
SELECT * FROM Persons P
INNER JOIN Persons_Articles PA ON PA.id_person = P.id
INNER JOIN Articles A ON A.id = PA.id_article
WHERE (P.fullname = 'Mick Jagger' AND PA.role = 1) OR (P.fullname = 'Keith Richards' AND PA.role = 2)
假設您不能重復輸入文章(名稱和角色):
SELECT a.*
FROM articles a
JOIN persons_articles pa
ON pa.id_article = a.id
JOIN persons p
ON pa.id_person = p.id
AND ((p.fullname = 'Mick Jagger' AND pa.role = 1) OR (p.fullname = 'Keith Richards' AND pa.role = 2))
GROUP BY a.id
HAVING count(*) = 2;
更新
附帶說明一下,我永遠不會將全名存儲在數據庫中。這會導致使用UPDATE
和INSERT
進行更多工作,如果不小心,可能會導致名稱不匹配。 盡管工作量稍大,但是如果需要,您可以始終使用CONCAT()
名稱。
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