我有四张桌子，艺术家桌子，音乐表，音乐购买表和专辑购买表，如下所示;
基本上，我想根据音乐购买（购买表）和专辑购买（purchase_albums）获得最受欢迎的艺术家。任何帮助将不胜感激。
艺术家
id name
17 Rabadaba
23 Patrobas Abille
24 Pryce
音乐
id song_title artist_id album_id
30 Intro 17 15
38 Oli Mubi 17 15
52 Bwekiri 23 15
购买（音乐购买表）
id music_id member_id
1 30 7
2 38 7
3 52 7
purchased_albums
id album_id member_id
1 15 7
这是数据库架构
CREATE TABLE IF NOT EXISTS `albums` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` text NOT NULL,
`artist_id` int(11) NOT NULL,
`date` datetime NOT NULL,
`price` int(11) NOT NULL,
`pic_location` text NOT NULL,
`spinapp_cut` float NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=16 ;
--
-- Dumping data for table `albums`
--
INSERT INTO `albums` (`id`, `name`, `artist_id`, `date`, `price`, `pic_location`, `spinapp_cut`) VALUES
(15, 'Musanvu Kitundu', 17, '2014-04-30 05:15:46', 12000, 'uploads/p18mor8nof4u9jmn1jarqem1t5o5.jpg/', 2000);
CREATE TABLE IF NOT EXISTS `artists` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` text NOT NULL,
`date_posted` datetime NOT NULL,
`pic_location` text NOT NULL,
`website` text NOT NULL,
`press_contact` text NOT NULL,
`bio` text NOT NULL,
`country` text NOT NULL,
`artist_percentage` float NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=25 ;
INSERT INTO `artists` (`id`, `name`, `date_posted`, `pic_location`, `website`, `press_contact`, `bio`, `country`, `artist_percentage`) VALUES
(17, 'Rabadaba', '2014-04-30 05:10:09', 'uploads/p18moquhh918llbht17br1lbuig65.jpg/', '', '', 'Rabadaba, real names Ss real"', 'Uganda', 50),
(23, 'Patrobas Abille', '2014-05-05 08:14:04', 'uploads/p18n61g63h1imj1h7g1bmt2o7jr85.png/', '', '', 'About DUSTVILLE & CRANE GANG AMBASSADOR CALL ME THE DUST TRAFFICKER DA\n', 'Uganda', 40),
(24, 'Pryce', '2014-05-05 08:42:03', 'uploads/p18n631uoi10ogsrrp61mso196o5.jpg/', 'n/a', 'n/a', 'n/a', 'Uganda', 40);
CREATE TABLE IF NOT EXISTS `music` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`song_title` text NOT NULL,
`file_size` int(11) NOT NULL,
`artist_id` int(11) NOT NULL,
`date_posted` datetime NOT NULL,
`hashed_file_location` text NOT NULL,
`in_featured` int(11) NOT NULL,
`album_id` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=62 ;
INSERT INTO `music` (`id`, `song_title`, `file_size`, `artist_id`, `date_posted`, `hashed_file_location`, `in_featured`, `album_id`) VALUES
(27, 'Side Dish ft Cindy', 4896804, 17, '2014-04-30 06:02:21', 'uploads/p18motu3jt1s7k10r53rkasnqc65.mp3/', 0, 15),
(28, 'Yegwe ft Gatimo', 4544161, 17, '2014-04-30 06:03:16', 'uploads/p18motvqu9l09vu41n5h88huvp5.mp3/', 0, 15),
(29, 'Byanema ft Gatimo', 4477129, 17, '2014-04-30 06:04:08', 'uploads/p18mou1duo1nma1ealkdk571po85.mp3/', 0, 15),
(30, 'We Done ft Atlas da African', 4770033, 17, '2014-04-30 06:05:28', 'uploads/p18mou3oku1cv5ai8brgn4r87k5.mp3/', 0, 15),
(36, 'Okoona Mu', 3110008, 17, '2014-04-30 06:39:52', 'uploads/p18mp02v3v1a8pnatmj31jka1q6t5.mp3/', 0, 0),
(37, 'Tonsobola', 3879091, 17, '2014-04-30 06:40:51', 'uploads/p18mp04ck3kc861i7teidd1rj15.mp3/', 0, 0),
(38, 'Love Portion', 4486276, 17, '2014-04-30 06:41:31', 'uploads/p18mp05m1r116rrk11inbthroff5.mp3/', 1, 0),
(51, 'We Are', 4515443, 23, '2014-05-05 08:23:45', 'uploads/p18n620b5e1qr118ui1mcj1am0tmb5.mp3/', 0, 0),
(52, '256', 3679294, 23, '2014-05-05 08:37:46', 'uploads/p18n62pur24471h9o13hk115g11dm5.mp3/', 1, 0),
CREATE TABLE IF NOT EXISTS `purchased_albums` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`album_id` int(11) NOT NULL,
`member_id` int(11) NOT NULL,
`date` datetime NOT NULL,
`ac` float NOT NULL,
`sc` float NOT NULL,
`paid` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=2 ;
INSERT INTO `purchased_albums` (`id`, `album_id`, `member_id`, `date`, `ac`, `sc`, `paid`) VALUES
(1, 15, 7, '2014-05-05 15:52:17', 10000, 2000, 0);
CREATE TABLE IF NOT EXISTS `purchases` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`music_id` int(11) NOT NULL,
`member_id` int(11) NOT NULL,
`date` datetime NOT NULL,
`artist_cut` float NOT NULL,
`spinapp_cut` float NOT NULL,
`paid` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ;
INSERT INTO `purchases` (`id`, `music_id`, `member_id`, `date`, `artist_cut`, `spinapp_cut`, `paid`) VALUES
(1, 30, 7, '2014-04-30 06:20:42', 450, 450, 0),
(2, 38, 7, '2014-04-30 09:56:23', 450, 450, 0),
(3, 52, 7, '2014-05-05 09:17:34', 360, 540, 0);
答案 0 :(得分：1)
您需要另一个只保留以下信息的表albums：
id，artist_id，name
然后，您可以运行以下查询以获取您要求的信息：
SELECT
x.id,
x.name,
x.date_posted,
x.pic_location,
x.website,
x.press_contact,
x.bio,
x.country,
x.artist_percentage,
SUM(x.sales) AS sales
FROM (
(
SELECT
a.*,
COUNT(*) AS sales
FROM
purchases AS p
LEFT JOIN music AS m ON p.music_id = m.id
LEFT JOIN artists AS a ON m.artist_id = a.id
GROUP BY a.id
ORDER BY COUNT(*) DESC
) UNION (
SELECT
a.*,
COUNT(*) AS sales
FROM
purchased_albums AS p
LEFT JOIN albums AS ab ON p.album_id = ab.id
LEFT JOIN artists AS a ON ab.artist_id = a.id
GROUP BY m.album_id,a.id
ORDER BY COUNT(*) DESC
)
) AS x
GROUP BY x.id
ORDER BY x.sales DESC
答案 1 :(得分：1)
这很复杂，所以你可以试试。
select
a.id ,
a.name,
tot_music_count_in_album,
tot_music_count_in_music,
sum(tot_music_count_in_album+tot_music_count_in_music) as total_count
from artists a
inner join
(
select
count(*) as tot_music_count_in_album,
m.artist_id
from
music m INNER join purchased_albums pa on pa.album_id = m.album_id
group by m.artist_id
)t1 on t1.artist_id = a.id
inner join
(
select
count(*) as tot_music_count_in_music,
p.music_id,
m.artist_id
from purchases p INNER join music m on m.id = p.music_id
group by m.artist_id
)t2 on t2.artist_id = a.id
group by a.id
order by total_count desc limit 1
;
tot_music_count_in_album是与作为完整专辑出售的相册相关联的音乐总数
tot_music_count_in_music是作为个人音乐购买销售的音乐总数
如果您希望所有艺术家按降序列出，您可以取出limit 1。