MySQL嵌套计数语句

假设我有两张表，我想计算最畅销的艺术家：

• 音乐（id、标题、条形码）
• 艺术家（条形码、艺术家）

此查询返回例如：

  sells    | barcode |   artist
 ---------------------------------
   1000        123       jdoe
    500        223       kloe
    100        321       jdoe

我如何计算jdoe复杂地卖出了1100首音乐

---

提前感谢您的提示

您应该将

分组方式

从

条码

更改为

艺术家

（并从

选择

语句中删除

条码

）：

SELECT COUNT(m.barcode) AS popular, m.barcode, a.artist, SUM(a.sell) 
FROM `music` AS m 
LEFT JOIN `artists` AS a 
ON (m.barcode = a.barcode)
WHERE a.artist = 'jdoe'
GROUP BY m.barcode 
ORDER BY `popular` DESC

---

呃，按艺术家分组？如果你不关心单个条形码，为什么要选择和分组它们？

SELECT COUNT(m.barcode) AS popular, m.barcode, a.artist, SUM(a.sell) 
FROM `music` AS m 
LEFT JOIN `artists` AS a 
ON (m.barcode = a.barcode)
WHERE a.artist = 'jdoe'
GROUP BY m.barcode 
ORDER BY `popular` DESC

SELECT COUNT(m.barcode) AS sells, artist
FROM music m LEFT JOIN
     artists a
     ON m.barcode = a.barcode
GROUP BY artist
ORDER BY sells DESC;