mysql - MySQL 嵌套计数语句

Question

假设我有 2 张桌子，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）

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

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 复杂地销售了 1100 首音乐？

提前感谢您的任何提示

Answer 1

您应该将group byfrom更改barcode为artist（并barcode从select语句中删除）：

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;

Answer 2

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